Malicious PDF — malware analysis report

Static analysis result for SHA-256 c604338071fb36cf…

MALICIOUS

PDF

93.8 KB Created: 2021-07-10 06:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b08adaefe19c0c144fe06079c8877bb7 SHA-1: aa01cbd571aa0d244306f719ec538816b37a3e83 SHA-256: c604338071fb36cf06a18b1dd8fc8056243f4db9ccdaaaa92697a078c7108eb1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to distributing further malware or leading users to fraudulent sites. No scripts were extracted, but the PDF structure itself is weaponized to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://aexpress.lv/index/images/up/file/wororixene.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/affb7112a725eda8b477056a399c4f7f/tolanaw.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/tofove.pdf
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/18885661991.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/rue22dh08460h8272r143dbnri/43070432807.pdf
    • https://hoakhanh.vn/uploads/image/files/63679568178.pdf
    • http://anma.pl/anma_edytor/file/67205685085.pdf
    • http://smcertificationservices.com/userfiles/files/27410593713.pdf
    • https://tavio.ru/files/file/refuwekixipin.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc294703e---9711647806.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/646109f08f28c7de8aea64c0373b9ac3/lofokekupavolariweredu.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076907bbb72d---mesokaruwazalofetawos.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/d15ac64c49729b90703255edf5677dc8/86276178722.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a17666917f---vegopowelidoz.pdf
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/zazudenupanufiwuwul.pdf
    • http://constantcontinuity.com/membership/data//files/xekifojikora.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/71a3cd12eed08d9eb94fcd273216d8b0/36463090556.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a19a7554e29---62365396399.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5cf597792---numufuxukedunaru.pdf
    • https://balaji-technology.com/userfiles/file/2136080408.pdf
    • https://theatresaucinema.fr/uploads/file/verifotiridibo.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7cd19c799a6e2187f3b596d2bb65ded1/sojibojotizur.pdf
    • http://tlumacz-lipno.pl/pdrzewiecki/files/mokixumamuzitalevedin.pdf
    • http://drairtools.com/ckfinder/userfiles/files/83817989946.pdf
    • https://childrencareandliteracysociety.org/userfiles/files/31265772851.pdf
    • https://maydangson.com/vietkiendo/upload/file/gokubupatab.pdf
    • https://energooptima.hu/upload/File/bopor.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d043003e23---38311304672.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hacks+for+pc+warzone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c7e.bin
437a3f98502d7123f2c07dfe5644e593f7c995b00ecb74de97ce081b7a75fe86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7E 10464 bytes
font_01_sfnt_off0001247d.bin
13df1cc878ac817c5c55dfaac137b8a67f8436e59a76594dd23a261755587a0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1247D 17284 bytes
font_02_sfnt_off00015185.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15185 16792 bytes

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