Malicious PDF — malware analysis report

Static analysis result for SHA-256 038b515b41fad2e5…

MALICIOUS

PDF

88.8 KB Created: 2021-07-18 13:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81dc7512d5f47d624d2b173e4ff8c13b SHA-1: 9f9819893737e6f8eb79539d8656e543fe1df810 SHA-256: 038b515b41fad2e512dfc899b53a2cc6da595073d33ec3ebb4b41e0a930af58e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDFs. This pattern suggests the document functions as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/meg6misokiftecirago5fp1oer/zonipetabibesosofeko.pdf In PDF document text
    • http://phuocthuan.vn/images/pic/file/rakobabunisazinokisudar.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/i952tcp3eode0uiapjhef6ikuf/gobux.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/41068662938.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/7f67d5d04004913389b90f4cfd6b97f6/5889581695.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf3e520cc---65624448369.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e410273642---98775354602.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/177f3ae08d99af41d3ccde40eb5025ee/fagonunelibe.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/sejekuxugipiduxoli.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2ce580b3608db851ea5f78955e3aa046/59214265203.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7hivbpdhisk1eclrtj9bfkpmc4/segurez.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/199b5001c31118983346aa281e8e6204/woxujapixipavifenapopisu.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/papidatolexewurebonaw.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/a275e967f43c67cb02b12d9e8cbec0cd/19573068865.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/31993998340.pdfIn PDF document text
    • http://poorclarescork.ie/images/saponanam.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9b8d6048---30934704555.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f603855cea44c394e5893f07cca241e2/japigavar.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1547ed8be---1397983975.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd0bbb327e---67762489109.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4ffdb094b---lokukutadodogedula.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083b86b8f3be---67632678889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=chinese+alphabet+for+beginners+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_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 10948 bytes
SHA-256: f7e9cca55f4fb485357619d9eba1b4bec9e194708f9902591d96a7144f5bf7fd
font_01_sfnt_off0001018d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001199f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199F 24264 bytes
SHA-256: e26ceec890136f151e3b11a86814fdd68dabb277f7ed358cc95df724dce46b7f

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