Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f5aeb547199591…

MALICIOUS

PDF

80.1 KB Created: 2021-08-16 22:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 15e6222ec9e0580882c7ef8f41d77f6d SHA-1: 627de0dea09594027594c4dd51f1dc90a659710c SHA-256: c6f5aeb547199591e710d1187cb8be6449d2718c5348637ddebc676958fcc787
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to lure users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://synerhu.ru/uplcv?utm_term=adding+and+subtracting+integers+word+problems+6th+grade PDF link annotation
    • http://mosjob.ru/images/file/80721217001.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/f5cb1c598f00872cd930605715e7a41e/fidopomitapejetatediseji.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8622m9ea6bepftitmplpatpmu7/83704529119.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/junulemopavetobitukulan.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609404baefb70---wusikiz.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/6961970274.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/kolorex.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/visivinajemoxidosas.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/978de5217ba7fc9ccde5f06c35039bb3/40660005755.pdfIn PDF document text
    • http://multifamilyfoundation.org/clients/3/38/38c33163524538bb895552046de0b362/File/kegasegiloxipefino.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/vafigibenisebabi.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e56788dca---58272393552.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/87389010966.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/39601bb2d126722c0d8a33dbd5d170ba/lasix.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0955e250b14158536a3ca7d4aedf2496/porimubujaralatinotuvasug.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8913a20e06d5d99c0bc5febb85ae617b/najifunisajisojupokamu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8bfde3945---3620393084.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160732fbf488db---14458612880.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/lokine.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc4199181---15343444747.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/51390322683.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/folexovavixaxemevikek.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/95592028698.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16079dfe858094---bidaxolokojewubuzipadu.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_off0000d2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 17024 bytes
SHA-256: 3eebc8eb7340af667cc47c348e286b5de54a242446a70f3fb6775830b2770563
font_02_sfnt_off00011783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11783 11436 bytes
SHA-256: 3eb5bdca4af10d1b02b60a23777bb15bf88e20db822864bcbfc65bb780f28af2

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