Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba43f5a15d06744…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 00:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2cb767d5e346f272d8001252e3a60167 SHA-1: 0a1b8d8d5e5bd78ba68c5ce5c2c7c8fdda050f2a SHA-256: bba43f5a15d06744cd3bce5369c8602d512bb6afd6bf9876cf007ac3e9fa99e0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a malicious PDF detected by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may instruct users to decrypt an archive, a common tactic for evading gateway security. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://archism.ru/uplcv?utm_term=pokemon+dark+rising+2+download PDF link annotation
    • https://lordoptika.hu/files/files/judiroxoneseruzunijajege.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/wefazatawom.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210914_3B3A39C5D9138DEE.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/c496c0f4a1175b7008ba378df06838d2/4071498923.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/59349622085.pdfIn PDF document text
    • http://beiks.info/public/file/nadosikififovasewi.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/sazizadumasukuridego.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/71669523295.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/ziwijewal.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/notimus.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3df6d3fb960163b58156fb027e1b473d/2096100143.pdfIn PDF document text
    • https://tarsiman.ee/files/file/16720550635.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/81707635693.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/nedetubax.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210912_010516.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/21823773115.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/pifezisenejafo.pdfIn PDF document text
    • https://gulamanis.com/contents/files/wavivudedoridow.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fdec8449d---88162085767.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/maset.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/zupodosoxa.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/72b75b09fca471787658188a1dcd4f14/linapopilu.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/dukujobemejaxebutokelo.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/fuvozilegedutu.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/poguledumomokifud.pdfIn PDF document text
    • 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_off0000da37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 17308 bytes
SHA-256: 1b3603ee02d856677d42d7fbd4a83f8d8820b52b3e9d989c5a6c6af0dba0582d
font_01_sfnt_off00010771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F88 10792 bytes
SHA-256: 71fe2c0cfc3f69d83ebf8299c2934c397a3cc4a77aa87790061bc2b30076ce7a

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