Malicious PDF — malware analysis report

Static analysis result for SHA-256 21130d0fa657a07e…

MALICIOUS

PDF

152.6 KB Created: 2021-07-06 14:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0819f25fa0332ad0b3138f3abe6c556 SHA-1: ecc204ace9d800cda80f80d629a7a58a7adc4568 SHA-256: 21130d0fa657a07eeaacb2c6703b3d0b9739e4ae3ede3c2e757ed8d5f80e3b74
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and numerous external links are characteristic of a lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/7kto9assseuqm5n8g6l347d6l5/puloxikepojilu.pdf In PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/33484164080.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/xonaxilufumiborulemo.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/pusetefijezomadefiteb.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4514ad5580---80060120345.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073ce79a4331---pakejixeraki.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/nivufofokasulowagaxufaloj.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c993da3cf---14090326019.pdfIn PDF document text
    • http://e-sportis.com/images/upload/kepupezupabedazitub.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/kumikiwirebukujidoxeto.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/0e8mhbnngnledp7q66jvu1bj6a/9022019160.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/11765995125.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/lizesasulavuronop.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8cf661e9---93825756375.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/f30b04c1d932797c19fc3506551226b8/84183576953.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/35477097822.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803d26874d6---xekuzuxegodi.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f8938041a79e730771b9517644819e83/86509273756.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf523ce627---87267711030.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/fumopub.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/62938472771.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/ziwux.pdfIn PDF document text
    • https://tipresentoio.it/images/file/fupigazig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+first+glastonburyPDF 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_off0001f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3C7 10812 bytes
SHA-256: ac76dc41684da15b6353ae69d5146fc4d88b6ffdbd6b11bff8ba62b1d1379446
font_01_sfnt_off00020cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20CB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000224cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224CB 18608 bytes
SHA-256: fe454c4e2320fcc928b2d12411ba9501e0f8f8d19a85eb47a41b2f3161c5119a