Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce30661486c41f2…

MALICIOUS

PDF

96.9 KB Created: 2021-08-18 12:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7825dd28dbdecab3fd086e80f0cc8c69 SHA-1: ad8d53e07fa336f109f6d091acbadbf3c6c0574c SHA-256: cce30661486c41f2ecb880d2b4649fd628f195dcff1bef2273437649e718d398
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to host malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this phishing or malware distribution tactic. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://prana.video/wp-content/plugins/super-forms/uploads/php/files/6phujrccpvu29iho9vbg6lvm1g/65641214029.pdf In PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075fcf3d59bf---durekafotavikasavim.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/99348393066.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/rezuvixapo.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/77389046711.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/63905225460.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/xonosigokamu.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/rejupitemutiseze.pdfIn PDF document text
    • https://designclarf.it/file/pivejosutar.pdfIn PDF document text
    • https://cape-electronics.com/media/file/nomewuzoposeba.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/09193bc30f626d0e1e6b85226187d147/zoxudazitefixamalop.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99151a1e85---12644017277.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775e1f3bc7b---jowatudodulaxosu.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/jepomama.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/52742916083.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff1be2b2ba2---wamonesarekazadijekukopi.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/5919784922.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103da6bb9b73---tezuwaw.pdfIn PDF document text
    • https://nevisnews.com/userfiles/bimezabapif.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a488e813df7---gezofonotudamazulolip.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/85406320017.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610afea2d4323---32768706522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=resume+d%27oeuvre+litteraire+africaine+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_off000114fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 11028 bytes
SHA-256: 54c557ae36bd83533d727130c3d9f3689a5a3f1816523989dd6a939a67b315eb
font_02_sfnt_off000146c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C3 18452 bytes
SHA-256: 4b734158f2c67bbfcc44abd33061a758ac0bad03569c9ff368b37c57ad8bc725

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