Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0fefa61d9c4b49…

MALICIOUS

PDF

94.7 KB Created: 2021-08-20 01:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f18bfe42e03f2a37df9f49947f25a6dd SHA-1: e10517def223fffa4611da2fb25607ff68269d80 SHA-256: cb0fefa61d9c4b4980e48373148f0a26bc6b3277d92374d529b6b3aee58c7191
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or redirect users. The presence of multiple link farms pointing to compromised WordPress sites suggests an attempt to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4910631079fa52da965e2dc2b4627012/14616287147.pdf In PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/sivugusuxi.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/fujodiguxutasoma.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/bukejareki.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/34061284597.pdfIn PDF document text
    • http://etre-belle.su/images/file/jujepojotuze.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608571f530bbe---ronujekoxu.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/64643942543.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/30074336603.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/metedelogilupejobekexopom.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/vebaxotimopekiw.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/wanonufefuv.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/96147587248.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57b731a9d3---20482903070.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd47949763e---limotutogolenibemudefof.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/35352776967.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/408dd63fa66967234172a50091932df6/36004779757.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/0e0627204683525328c40883c7f971b7/53913139828.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/22688694880.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/12349534820.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/fea5442a4bfc3416aa4814e47d7db48b/18496404267.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/wurazepidomik.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/13ed39a2c9554ba0cf4d1043312ca512/93814402107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=david+griffin+ritual+magic+manualPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/60b06b7f30c14248a11dc078050bb8be/gifebusemuwozowopopojar.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_off00010cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D7 10568 bytes
SHA-256: e3becf3c2782de81214b10607f8aa902e7141fcc857ed00f3be54609fb76f9b5
font_02_sfnt_off00013cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB9 18328 bytes
SHA-256: e085184d3591e52687dfc7a078246eea8261303365dba68db902f2ccc1c2e1e2

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