Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a217abe6099936…

MALICIOUS

PDF

97.1 KB Created: 2021-09-08 20:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 168e562f0951e17972be02ac965b7126 SHA-1: 33625f58cf9ee79084bedf51d91528ebb6301376 SHA-256: 41a217abe60999364c38c948d96a898feb761d1499d5c83cde1b9f0ce679d72a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://rgcsmt.org/ckfinder/userfiles/files/10600673479.pdf In PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137992288efe---sizupusegotamorojaviruwe.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210906154242.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/99208309393.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/18299554955.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/62104600635.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/xekenijijofit.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130783e5987b---87190098966.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/jinuno.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/201b9295e7d3edb83f563d522a239b0a/41563454186.pdfIn PDF document text
    • http://esangsok.com/upfile/files/11542521121.pdfIn PDF document text
    • https://jotelek.hu/files/file/17576084285.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/99477668850.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/46391195841.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/wuwopale.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/pevod.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/rezudigomavofijewasexegef.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/93096087096.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/11030286254.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/bitaxowis.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/36490482354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=encuesta+definicion+segun+autores+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_off000112b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B0 20440 bytes
SHA-256: ddca866c10e30c987e65768b42cc3eb3c055ccc95987dedd228d1d6cd13520ad
font_01_sfnt_off00014623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14623 10832 bytes
SHA-256: 44b6f34e4e9363d6781355d61d79063474a65ba9fe0906d68f82c7463dc58654
font_02_sfnt_off00015f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1