Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a29c2078c1c9920…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 07:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3987a170bcd883cb27f1ad18346f398d SHA-1: 4e3d6529cb3d9b4d911eec69ba6b5e2f1d229c3a SHA-256: 5a29c2078c1c992084bd32be782d687bb794edc0a6a3769188c0cb6bca770ea6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable domains, suggesting it is used to redirect users to phishing or malware hosting sites. No scripts were extracted, but the structure and numerous links strongly suggest a malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=java+oop+interview+questions+pdf PDF link annotation
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c81c3a4f680efd007903ae239cb9b12e/76178862924.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/filifiwepavobarujikeku.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607489ea3bf7e---17155518478.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/3284982012.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/02avof969576jatll49uhmjgff/8292397196.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/11419312537.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/95460e59e51f4d9d84b40c1df826effb/71548598864.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/32f9d01276e327c0aeca163132246005/pogemimabedopadatup.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f17bcf7b0a6cff52f94e5493d5b39e17/46483687027.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/73455221231.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/tavozador.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/57023988355.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/16512838331.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/93295801177.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jaletono.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608177a20306b---medato.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/xerenujiselilamamejexuk.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/77369804825.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160892b3b79065---mugade.pdfIn PDF document text
    • http://simonide.org/userfiles/file/58481142724.pdfIn PDF document text
    • http://deforma.it/userfiles/files/wuruv.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c6beaede18c---salagol.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/81221487743.pdfIn PDF document text
    • http://innotack.com/userfiles/files/55915787190.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/rotipawegutapozenudon.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FE 17920 bytes
SHA-256: c049aa5c06a650354460b984c1494f0164f1d56e25e2131b5e0eabadda64e697
font_01_sfnt_off0000ff24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001173b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173B 10836 bytes
SHA-256: 357df8736d3146c30eafe9dc14062c253c50b3e63c36cedcd85d3ee6a09a01be

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