Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec32428882f47488…

MALICIOUS

PDF

68.7 KB Created: 2021-09-20 18:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ee986cc2f30db33a4029e6a718e436b SHA-1: d90905c93f80c57856a0f095870f84d89e9480bb SHA-256: ec32428882f474889de1d3a13bffe8321a4ec2956f82361eb6c52502ba3f05f3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to obscure the ultimate destination or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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.
  • 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://wildpflanzen-planung.de/file/16446393279.pdf In PDF document text
    • http://sushiloverca.com/uploads/files/zagalobexajegebavikojakef.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/49164284266.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/fukalof.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/nutifevebelalegemoxofod.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/wetegimoralatanenomuka.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/99069638485.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/mokigemefi.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/tawed.pdfIn PDF document text
    • https://bor-diing.com/upload/files/taluvagojekixi.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/wojifumolir.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/13791950860.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/81055202669.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/pizujonibewuzelajuwigi.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/17734722606.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/10432744032.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/fonibodevoxosezuwuzu.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d517701825---dusipatofijigaboridilobom.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/20875200535.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135070f241fe---lekamogudasapakafobeva.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/15e98322e013e37b6cd50f09c011c1c0/xanujunoruluzow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cell+to+singularity+mod+apk+android+1PDF 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_off0000ac21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC21 14976 bytes
SHA-256: 796b3f4b3fc8e1f0acf928aefcd22f86d8309ddb49445e563d980134b18660ec
font_01_sfnt_off0000d1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FD 11124 bytes
SHA-256: 6431e5b2b1207f3eee5e08e0426bfd5d72e5a7485aaf5f31e46e83924d6887dd
font_02_sfnt_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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