Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a31519fc03e3cae…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 08:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a99e18101e859659b2ce41720bcafe5 SHA-1: f300ab276d2327bc49448ba56a82824c0dc01081 SHA-256: 6a31519fc03e3caeb70ccc6ca2ceb30e84a155281eb22815ad10d868306ccd1e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded JavaScript stream and numerous external URIs that form a link farm, many pointing to PDF files hosted on compromised WordPress sites. The presence of JavaScript and the link farm structure suggest an attempt to redirect users to malicious sites or download further payloads, aligning with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • 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://nomylo.ru/uplcv?utm_term=naruto+pain+live+wallpaper
    • http://charmingcurls.se/upload/file/tarafolo.pdf
    • http://phaptangpgvn.net/app/webroot/upload/files/77017182666.pdf
    • http://amexeuro.com/an3_Uploads/file/tifoj.pdf
    • https://inunekocp.jp/mailmagazine/upload/files/nagoserafetukomi.pdf
    • https://vanphongphamhienluong.com/upload/files/24617359980.pdf
    • http://abwingsbuffalo.com/uploads/files/63862447548.pdf
    • https://ssekolkata.com/ckfinder/userfiles/files/sogex.pdf
    • http://aaas.handyfriendship.com/upload/files/55499209130.pdf
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/77604106229.pdf
    • https://buddhaart.in/userfiles/file/jaruwupe.pdf
    • http://aytekinpolatel.com/image/files/95617498859.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2408cb35---23954231971.pdf
    • https://tierlistei.ch/downloads/nomexelupivobezovowof.pdf
    • https://betenrealestate.com/sites/default/files/file/53879533947.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613956a75abce---43847258156.pdf
    • http://longthinhphat.net/uploads/files/jinuranagujurunulafejipiz.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613693d5450a0---89832010686.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba98a2597d---81184825542.pdf
    • https://vicotelecom.vn/static/source/images/file/vazufasovugupabi.pdf
    • http://dubilex.com/userfiles/files/19199745084.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2ad8326d1---rafodolup.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161384d609fd7a---wilafadetinobopulunivoji.pdf
    • http://ikuma-car.com/js/upload/files/romozevuzu.pdf
    • http://phaptangpgvn.net/ap
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b993.bin
d14817fe024dae45456912964ff309f472ed1a1e5dd379cfe0061b4a9cbd405f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB993 17232 bytes
font_01_sfnt_off0000e5b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 16792 bytes
font_02_sfnt_off0000fdcc.bin
38a95b3400967e26a2ea16b25ea7c97809b0be67f7b74903f1349c78a8d3f4dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 10304 bytes

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