Malicious PDF — malware analysis report

Static analysis result for SHA-256 8472a9e13dcbce0c…

MALICIOUS

PDF

92.1 KB Created: 2021-07-21 08:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e4794e714aec34b34f00f635caf53bb SHA-1: 459bb02daea5bca28ef6de2504fec414f596cf48 SHA-256: 8472a9e13dcbce0cf80e200a23fb490f3b051b931c61ad5d778f39b9d7b79046
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised or disposable hosting, likely to redirect users to phishing or malware sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3e7fa64a6b451179e0e865ee65f04c61/jafivuwatavasusi.pdf In PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/kdu9me159mdc56v1ruq2mg5ul5/zesipifonetif.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/89317505374.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/80032546131.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c09a29040db---pubajafadabudebekela.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/99762036484.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/pupobagifomasusoror.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16094bfc81866c---2245411562.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d57802b1f27---25305514994.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210713_48FEEF5A3C4772D4.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6d70f1814bc9b3024969df7ae50bf47b/69359833184.pdfIn PDF document text
    • http://signauction.net/userfiles/file/22162830114.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/rovegi.pdfIn PDF document text
    • https://somogyplusz.hu/files/17150300716.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d247ad5267e510966be4c70f47ef2bc6/notigesiz.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/penizadawupitezolodu.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084feddb192b---mowolozujoj.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/31377036574.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/9b37d02780087e44f514cb72c539ef6a/63900887253.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/2955656150.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d1808c2d93fc7d34690854ca31b12e58/fubotigutizumam.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/33870671691.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/68815250390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=provision+meaning+englishPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/48efc9f98d5f5a7d44edd3aa2eae2865/xulebufotirepe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014934.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14934 16660 bytes
SHA-256: e0d071e1fa2576aaa4c70ba38f2c70ceac17aae272d0424486a6ee4ba0debe5a
font_00_sfnt_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 10524 bytes
SHA-256: ee3da76c4718498900c4fc8b896f83ced94406b630702074cb03e8c4c8f3d9e2
font_01_sfnt_off0001027f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027F 17748 bytes
SHA-256: 70e4df6c1db9148ec3e8a53fd5557e594cfd5af7e06d5a2475120480027e6e3c
font_02_sfnt_off00013123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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