Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad35ede92cd918f7…

MALICIOUS

PDF

80.5 KB Created: 2021-08-14 11:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e728a47aa2b37f87e2bd397818a511d6 SHA-1: 75ae92451ed774450e295745890fca612340e182 SHA-256: ad35ede92cd918f76ef1142b5545a207369852f483c3a500497eafb89fdd700f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to exploit kits. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://stollerco.com/testingsites/advantage_aviation/assets/media/file/dukexefilufuzukivisataf.pdf In PDF document text
    • http://sciattella.net/images/file/pinobawujepadimizozuraj.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/jadobiremukufipesoguzosi.pdfIn PDF document text
    • http://asvpp.fr/pdf/25307066286.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/e27e6f389b68fcf56374523fc2cbf300/sesirobejorudadasif.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/791fbbd417decf94f68cb745be04d6e9/wopoxonekafisokonasol.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/zelog.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/lesufozuli.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071aea490454---89063124050.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1b54c9922ad11f241266af3c7ed80490/19165330697.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/74010506670.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/65666868274.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1i3ru2oii1i6dfd1tvmeqjkn54/74674265601.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/xonaxilinavejopagevige.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/226888454.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/2617474765.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096aed653226---nisalufitugakuxotowepi.pdfIn PDF document text
    • http://lelit.nl/app/webroot/files/userfiles/files/8778695456.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6g1cs3r62p47ltagaq1tbo118e/75430670253.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/78095301420.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/jefeb.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/luxuborevure.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/u2k2aot4dioc7i6sjv18aatet2/90690520345.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/lemuvugoxisajovif.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dab8qmu33sk0db87u1ukfkr0l1/15507494067.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/58265212353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=possessive+pronouns+worksheets+for+grade+4+with+answersPDF 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_off0000d5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 11152 bytes
SHA-256: df706a9b4a5831fe76d595af52223f11a2b015c168bf5f29cf5f323405bed8bd
font_01_sfnt_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 16888 bytes
SHA-256: 79600bfe3647f4ba516bdcd022b45f4cb06d7364be14b6b514c91eb39911e427
font_02_sfnt_off00011ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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