Malicious PDF — malware analysis report

Static analysis result for SHA-256 52785a34b66abdb5…

MALICIOUS

PDF

76.6 KB Created: 2021-10-09 10:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 05174931500f1092432b2af5a97421a8 SHA-1: fbd16973f55a6d02d500e91015e4db801baf632a SHA-256: 52785a34b66abdb5e3abdb4323c7ad2416ef881988048046eb36c7569fbf16c7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or malware distribution lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, offering no direct user-facing content but containing numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ivelinabozilova.com/userfiles/file/fugidekumaforowetudolame.pdf In PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/072d7d294c25962edaad3be093edf5f8/55322917263.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/54306310574.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/11866488852.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a4a74921dc49421fa45262e3d8be7ae5/xekiwilojulogiw.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/05/kegorem.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16148306ad527d---genagivupagimi.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/nalolamalunevogisev.pdfIn PDF document text
    • https://desmar.cl/gestion/admin/images/upload/file/lufuvekivasoboz.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/susoxifuvovalu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8b338e53ab981616600e98c9b1a3d7f7/ravuger.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/xajotukulo.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/48978679702.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/lelexogaredazamolojux.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/85267380401.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/525268093.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/42294221712.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161531787bb8fb---86387547793.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/riresotedelegorezol.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/merulekomerubezalojug.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f9412eedf---38125715733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=galapagos+in+augustPDF 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_off0000c86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 10332 bytes
SHA-256: 7543c7e97a96d7aeb5ef8a76f15ea828e16ba523f46ba84e275380d47f8417b6
font_02_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 17644 bytes
SHA-256: fe773eaadfab836285c1510582dd28792b07670eacdc2b375a6734c3eaeccdd0

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