Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb4d9d9c3397bbd…

MALICIOUS

PDF

94.4 KB Created: 2021-07-04 20:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28ef0ec8b03cd917325e1a3a2ae6a92d SHA-1: 33648ad7905f2cbada757fe7105279c170ac515d SHA-256: 4bb4d9d9c3397bbdb37f94e7b605490fd39a9a13123c67e9fd185546a6fe0505
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to compromised CMS uploads and disposable hosting, which likely serve as lures to download further malicious content. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bosgo.mn/uploads/files/dumokukagokerixemiwolexaf.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/00df840098eb9450917c73f28e3a07a2/fepajaganinofaz.pdf
    • https://prairieroseclothiers.com/FCKeditor/file/10419538480.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0312f0ef1908bb5d64a8c7c3f17a791a/wuvopexufuba.pdf
    • http://eastcoastbiker.de/sites/default/files/file/daramekag.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b244d2dd319---61253670010.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b823e60b21b---kilakifoko.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5f9816b09---mebamalivaramu.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9aa154d8a---32417840918.pdf
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/gilanofagunopi.pdf
    • http://angelescare.com/userfiles/file/1003560855.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/eab6f3b2de5099af912fb30399a6fd9c/61757949504.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/48cb6fdf69c9e3a836523cbb18b5f9ab/48552503856.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/oe1pgivgp6psnkm0fm19dkk131/62757738370.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210523030915.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d33ac8629---22401709152.pdf
    • https://sankohomestay.com/userfiles/files/karuninirabemivozejuke.pdf
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/meruzetuwinakenixorakuk.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/dik9r66kac6064lq890puqhin3/pulijoseleki.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/lcdt4tuaqkn87ofe2e4r2as4k3/vavuzix.pdf
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/54328627438.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160776327e20ae---6599782794.pdf
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/37289102085.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a218f861722---jubita.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f28c05781b7ce6f6f792c15e421bfcd7/53067290343.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pink+moon+yesterday
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f665.bin
031eae57e81e4d3bc4de3a544ef83d823c278aaf0cec871a4e482e69d0131ef6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 18148 bytes
font_01_sfnt_off00012628.bin
dda35901653cb9342be2d3b531dce2da44c5bae9ffae8fb5540a65a18be030ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 10568 bytes
font_02_sfnt_off00013e4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4B 16792 bytes
font_03_sfnt_off0001565c.bin
619820be33a98ba79d3834fb79637885008ece67c8bbca44bf9e21fbd6698b2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1565C 16172 bytes