Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1aab6ca6785b91d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 19:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0bc3e052bc9cf78356319a324fe16cbf SHA-1: f049af52b05a823cd0fce1a99c7fee2fc00840f4 SHA-256: e1aab6ca6785b91deaa250c13e38de7addfea29354565a4a45b702f14e636e36
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. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting it is used to distribute further malicious content or phishing lures. The presence of multiple external URIs and a link farm structure points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b702372c8ec1942d51ea3814487b1b92/koviladumevejibiwukija.pdf In PDF document text
    • http://fujiya-burbank.com/uploads/files/bugeveketo.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210621065449_g26nnf.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/35138015099.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/gubodar.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/o2o40chvhmj364di16ejgrsbg2/musikewepop.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/25926637175.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/76767589250.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/zoxivinetizigexizoxakun.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/46073003948.pdfIn PDF document text
    • http://staropolski.net/Upload/file/77676888740.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/3180ce7a47f7a36b284810454c88d2f8/99462302059.pdfIn PDF document text
    • https://emmaushuis.org/pages/lomuvogolewoja.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/423873db8f8a2cec5fcf9ae0bf5bfbb8/zajemexoniwu.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/kanenir.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/9075d76b1b29df167fc25b341a76d4d5/bikoxemopojafubafewavo.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de3f457f56f---25351462889.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/63b1bb6334b227fad7d85ff1bc8e698e/31492289399.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/c63885eba73fd2a28e0a4ee541d40292/notofobusujapiwifojuj.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f23762f6---3111316946.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a3a232113---88057392366.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/pomigitekezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=all+causative+verbs+pdfPDF 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_off0000bf58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF58 17728 bytes
SHA-256: 6f819449608fad252493867b4cf3533abad2c4870d2c0c24714af1dd6d1f4647
font_01_sfnt_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 10676 bytes
SHA-256: ca9bd02366e027d01c1de4dca7a5fb01a8612d26770ef15479003f33d60dfd9b
font_02_sfnt_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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