Malicious PDF — malware analysis report

Static analysis result for SHA-256 d270c189fdcbbac8…

MALICIOUS

PDF

90.7 KB Created: 2021-07-20 06:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: de67ae89d7dc3132cb9b5480fe21cd22 SHA-1: 3d409c65c79d5affa622bfb3f1cd951c2821785b SHA-256: d270c189fdcbbac8e4b97f3064f9faee26f5b3dedc5eda4c5c1259b0f99b0b4c
272 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and multiple links to external resources, some of which are hosted on compromised WordPress sites. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document prompts the user for sensitive recovery information, strongly suggesting a phishing or credential harvesting attempt. The ML classifier also flagged the PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://amitadevnani.com/userfiles/file/43040170283.pdf In PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/risabopadokavikuk.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/xulabudujojiwopirawed.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/f51862a7fad8182d042a3819aabe5756/juvabosuxoba.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/93418854937.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d2b6d36c3---maxizikatuxanojirafapik.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9a3def590a594a22d848e723e60a7de3/solasalapobutobufuwexisub.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/57209177446.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48a7a2073b---sezugil.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7685754239---razuwozilaxesunopadonokan.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608df95f4a58a---fokafekeg.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/vodafupanemiserukoxotos.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2e7f1a4a34db8507e17a23aae238fab4/54272505509.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/98232028243.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/11910504733.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc2c2d8d6---32995545514.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qdcmdl16cqr07da5h8979sp9r5/tisatorunomutofad.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/nexetewalewalavisat.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/84319388813.pdfIn macro / runtime command snippet
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/3ppkmmmqleonu1l7e1qp80t71s/tolokumopeseranisawidi.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/tezavojudatifek.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bce2b899c7f---pukomuxinepo.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/wepidi.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae24bd13654---72921233193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+run+apk+in+iphonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 17944 bytes
SHA-256: 9ed909770fb3b8e5ab9432b5a2a4d54054819db712ed051d373cb5aa83390fe8
font_01_sfnt_off00012e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2E 10404 bytes
SHA-256: 740fe3014f5b2653db4b7a632262661952b1120d6c93992df7a95d7b78d3f053
font_02_sfnt_off000145af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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