Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd70f3702a614014…

MALICIOUS

PDF

77.5 KB Created: 2021-06-06 11:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 797c589a5b0db6eba3d1660b0f9a596a SHA-1: 4c8c82ab30b3effcd48002b5c752cabac4b1eb35 SHA-256: cd70f3702a6140143e83366a177b79f1b7d9e64f89785baab39b5e1bebe9188d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=%25EF%25BF%25BC%25E6%2599%25BA%25E8%2583%25BD%25E6%2589%258B%25E8%25A1%25A8%25E5%25AE%2589%25E5%258D%2593%25E7%2589%2588%2528bt+notification+app+for+android%2529 PDF link annotation
    • http://www.deco-interieure.com/userfiles/file/gujar.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/83044d25dbbcdfff51c3b1049893ea05/vepesokafagudevi.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16081ef32310c1---rutekararobejezelixava.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8d83a612838393fb1b4593c26408c130/49233518196.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/57682157846.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609942ebf16b5---zagafasebuva.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/6qp37kn6nkhndaqh1rl15hrs36/99019918069.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/551f06a34ac0e45bf5eb3a9adebbe824/23234552998.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/rvfi6nv0lb0tia7s2dejgoe3ju/zokodefogojepuwituxirez.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7acffbfe49---duxemijobivajet.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a5814b7e9---1416731123.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/16ff5a6799dfb81e674e04014634bcd2/39925809257.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a1a591df053b239e5cef687d02c480e7/benafimuzurusevikuvavisuw.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098d1b5e32ee---kimib.pdfIn PDF document text
    • http://intergeored.com/upload/File/junidibipadune.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3020c39d---vurexukujeni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 4616 bytes
SHA-256: 609a874c402a5257ca0584b0f723e847e09c362105ee43c296a0706e547100ae
font_01_sfnt_off0000e4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D2 4816 bytes
SHA-256: b9e30f1b719c59fc9e11498ac49bd5b3c7a81ee4717f82581756d97c1f37f4cb
font_02_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 10132 bytes
SHA-256: 2d648d6cb4adea449c5c80d14d6ab32d34bf3cfb1590513c2c5e737862361ace
font_03_sfnt_off00011803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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