Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29b2d5e127955c7…

MALICIOUS

PDF

78.9 KB Created: 2021-09-10 04:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c1a5b4765dfa25e060b92413c12a3b5 SHA-1: f09f530b6b5f18eaa0d2987b8c9c0a588551394c SHA-256: a29b2d5e127955c74bfb95085569b8bdf9991b5b5f116797a50c77f9bc0c176c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/pulunaw.pdf In PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/61861924441.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/40858374667.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/larutedusejifuf.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/detifupuvenix.pdfIn PDF document text
    • http://lejonhund.com/upload/17344185892.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/12583804551.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/51752585502.pdfIn PDF document text
    • http://ustunongel.com/image/files/nujibimi.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/nunivotifitowafa.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/segob.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161331614594c4---vexibed.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/28997639153.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/63651223240.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/bofosiganisejeno.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/92295332568.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2a90727692824eeecc281c06589915cc/60285688148.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b59872568---rogopasiwam.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/75263969106.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/55612913739.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/39341776696.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/giguwuvodigerule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=uk+used+iphone+8+price+in+nigeria+slotPDF 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_off0000cb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 11200 bytes
SHA-256: 2cf6aa91cf9e04560c18337830b8af8f8311def0b160157eecd5b2b0bfd50cf5
font_02_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 18496 bytes
SHA-256: 171025eb037930d2a789c487ace065d17cdefea9527af40e7d26460a6680bfd0

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