Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8939af6ee0a004…

MALICIOUS

PDF

89.1 KB Created: 2021-07-14 03:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9977613f0c849421a28cd783559940db SHA-1: aa3ed8ba715855ee0c3275ea335ffa6e1e26a8a8 SHA-256: aa8939af6ee0a0045359c4609384be364d2e3e0987783bfe6b92f143f7d0319a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to numerous distinct domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://juhaszautovill.hu/userfiles/file/xununewunumejabazupum.pdf In PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e8813ad3---40437733846.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/cg3k2kne6mfu6gjiejk1oha8p1/80308982530.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/73762019209.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/mexivosusamogorusufotara.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/3koo305j7e59rkebgc4803u25v/rabusafin.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/cc282dea89221d16e311cbfe708e510a/66651671738.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/a5a181ed9d8b584e63b161f2e827771e/98498754120.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/49c01a232660d092c532413cb136a6f8/tiwixitisufigumupenikaw.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/movepod.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/legoke.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/bodugowibuwimibot.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/1dc8453e5fbfc6a9d1e974481d985dc1/kofedezularon.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/81657656722.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/15354543228.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/68358921849.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c6f9d7524755def1c37a2ba947b1998e/vanitobodu.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/jjt8gaj8ghri9as13jtsqu5ag0/nerub.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/cre2glq546drgqm6k6qgmagjs1/dawefawovavunemito.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/a472b8463a7dcfcd3273e97ce4ff807f/mepurolikajuriza.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/gebezisatenipi.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/47689082962.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/90850047549.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/gk4kicfjb3v62gnl6b1h6gloh0/seguwazubizinosota.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/92650deb83a78a97085bf2f9bbf9efeb/tefeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+not+summon+a+demon+lord+2PDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 18100 bytes
SHA-256: 9a988b7cd901609461ffbde23f5791f41cd9e066a62fd1c13d0fdf20e9b8cc01
font_02_sfnt_off000134e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E3 10616 bytes
SHA-256: 3b550dff7a9defe5b3b64246c26a3bf29b1017d989644efb0207903811e49978
font_03_sfnt_off00014d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D38 2060 bytes
SHA-256: d5601b205b1003338042a5fc6596286810f51dea4b320d51974fac876f1f8aec

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