Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c31b7b6effa4921…

MALICIOUS

PDF

84.0 KB Created: 2021-08-22 06:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f0a719834c8bfc4cfa53a7853b6c8a47 SHA-1: f6c9babc0fee6ea6fb427ec35989dc1de4449ec5 SHA-256: 6c31b7b6effa492186316e2921b69ab39475b19c2df518cb923fa1e8d6684009
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and embedded URLs are indicative of a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/b800e0186145c3e2caf46be0d7b0f3a4/vovukikuvobufu.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47ea09430d---59581311401.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7a9d8b460cd6bfa852e01abe3e2701ea/dinegosudirupobazobinud.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/86219566713.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/32256007254.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/gonefuvavumagolevep.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/ritodisika.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9b5c50748---90557304045.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/2l00bvv4ndp4djus4a02c0j1p7/59773834502.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/buderubonuligujupubaxon.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/55486321716.pdfIn PDF document text
    • http://sushibelovo.ru/files/46708286778.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/lulipagebodivemetinu.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d5a340c45ced97f6743d5ef456d0cab9/kajani.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/bazeborox.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bce2511e51b---27279395850.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/1336100805.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/70ba8c0919ef317a8ec7e90c02a26eee/gobexufotukixigexoxaju.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/fe69fa77a6b10ef20b65bafaff8869a7/jevezubibaxipafafafofatop.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160754d91cbdac---4130645642.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/3908de0b4b600fc618d79907a0a17f4b/44400881887.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/ruxavetel.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/co838177png00cgqfqh2npsmii/93055029279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=9+s%C4%B1n%C4%B1f+matematik+sonu%C3%A7+yay%C4%B1nlar%C4%B1+cevaplar%C4%B1+ebob+ekokPDF 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_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 11468 bytes
SHA-256: 3fa8933c3da0327a01fa0de3dcb416655cd4b2bae8b35a73c92b9ad179d68e61
font_01_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 18832 bytes
SHA-256: c83b71024478287537385dfbd6ea7751c7b9dc4d3a4b3d1d77307894834c6df9
font_02_sfnt_off00012699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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