Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d7b661b3937f90…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 07:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b08fbbce11a36f3bd816c54f5f720db SHA-1: 76e5eb804d5ed380c2cc6b784f839a35151f1892 SHA-256: c2d7b661b3937f9070c0ffc046c33ba624cdbd27dbcbcc866c039d1e3b177374
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=where+do+i+find+the+recycle+bin+on+my+phone PDF link annotation
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613f124141048---xofezepilimij.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/jekelunarifasuxazenofam.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/jipulemenes.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dezuluxinisetemipivavewol.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/60981848018.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/vuruxawuvebirir.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/15264950056.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/gimatuwugarawajafadewezed.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/junaburutebupijukogilize.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/27377905870.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/kh66ts8l5qhmqstfmg5faa96dr/renemetivasukijamuj.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/90120021251.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/wovofererujomijawebebo.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/fuxajopixonofanemob.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/depabeko.pdfIn PDF document text
    • http://almuhja.com/ckfinder/userfiles/files/ridiwokonalafojesubifep.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/xakutojevojuganirizumuva.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/42315293514.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/dorovupazatilani.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/t3d4817l9g2u60tk3hvc92qcvq/zitamodoboxa.pdfIn PDF document text
    • http://proart.by/media/file/22881022725.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/runatoderexaner.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144f62b266d5---sodobanadufatirunutol.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/82367240260.pdfIn PDF document text
    • 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_off0000d075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 10804 bytes
SHA-256: 095b8538d9d9d2ca3cd536087508f6d242e391ee71fc1dce500c7b19418b12d8
font_02_sfnt_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 17028 bytes
SHA-256: e12453269f3a14c650bfb22a4b03d5019e4a7bfa623245aaf859236f43498c53

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