Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1adfc16446343e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 23:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee90aa1276c9e5a38121c73f3734b909 SHA-1: bf0702aebc377a83ee5ba313e2ed22761d1ed5a4 SHA-256: 4d1adfc16446343e8351dc45420bf84360843ba3f2730c389e93370d79d14d06
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://mosjob.ru/images/file/28805215559.pdf In PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6b0a8e696cc683c2172df7a85a47d9f2/roguvoxovoduwexi.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/92996453997.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/maraguzukexuwoziwadora.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac36adf0121---80003231404.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/donataluzonibexumukunu.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecfd1a467c---gexis.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/gp4g9rhhbeo20opt397ir43db3/98558275739.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/or2tunkncbrhu853kcmttuf1b5/fojekuzonixazor.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee82cc400b9---23572993341.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/xilijidiz.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/77c6ac3e1f479e094347798ae99c3e65/fetiwisufemonuze.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e1ebe4d39e4918177ca52692c93df982/70836551566.pdfIn PDF document text
    • https://basisnomor.com/contents//files/44049400747.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/zofujexofamunoselilax.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160e0362c9b793---90686053279.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607215482c20e---12731688855.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/45278191031.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/jozawavudosapun.pdfIn PDF document text
    • http://elitacasa.it/images/file/30938332160.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/valenimofidetaruri.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/kijon.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ebq8hkfkmd8va3b92k2aq26th2/didegaxudiviwajabajunoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=abnormal+psychology+by+carson+and+butcher+pdfPDF 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_off0000d59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59B 11308 bytes
SHA-256: 064c2dba338ca89e6e6046b2cb674104719f69f5ddcebad6628b636bf89e7b45
font_01_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 17048 bytes
SHA-256: 434f7b904ecb368d32ebc113d34476f70b3040ae33d8dcd0a786aac6c7268f8c
font_02_sfnt_off00011bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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