Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76a2beb51d25a89…

MALICIOUS

PDF

94.1 KB Created: 2021-06-30 20:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 43fd076045c9b63d4832674997bf475e SHA-1: 40382a2b2a45e3987388cddf6c294f3d64f585c5 SHA-256: c76a2beb51d25a899002b4349dd240e9a789d48fb1ccaf90b3890e498e688364
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to lure users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure for SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608288c0ac955---zimoluzetedobawimibufuvo.pdf In PDF document text
    • https://aspirans.com/files/file/72670225326.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d9bcf5a5---dirodigivej.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d29e0e4ec---xexaxusuvibezefiruki.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/rajomagu.pdfIn PDF document text
    • https://masihpt1.com/contents//files/85697084049.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/secei17pp200pa5r8kl2imsdi2/lubujawebe.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/11688449537.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/64376932953.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/koxemigujakijapadazesaz.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/68e7f4a45187c799a60c60447ba6c1c6/ripavuxetosarajigomobi.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/22b3f457e599dc7724e5025c70957857/95914408564.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/vozobowuxitojumadotiwo.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/zipozokoraru.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/lalasefupikovugemoja.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a5a242d7063798a42ade71a335c7b9bf/zusoruvonera.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/fc698d36e8931b6f4a104ff7f11552b7/69528593434.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7606c7ad---95635513394.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/6f0d5e0fe8e8cf4365956751313859ee/vituxolivotixitajo.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/digevogizad.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/webipofelaj.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aed85b7ef78---sukir.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607081dc9fa59---9475854547.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160846a0e379c2---91842318508.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3585f69fe7---78402922646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=physics+for+scientists+and+engineers+10th+edition+solutions+manualPDF 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_off00010d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D12 11312 bytes
SHA-256: 060753204ad1ecb97f8497b81767810db5270dca785db1aa50a58e2fa71e229e
font_01_sfnt_off0001275b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6D 16700 bytes
SHA-256: 8be9655f8a31492621a1d328d8206408b5fef38424ec19fec71f6480e3734178