Malicious PDF — malware analysis report

Static analysis result for SHA-256 91df4e4a284d426d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 15:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fabff5fe8cfb33c1e86001c595d779dd SHA-1: 6b8fe869db11d14befdaf82da88b3f5c7e380d3d SHA-256: 91df4e4a284d426dac44d8e0db12393506aaaac2d92dc9ee9b73c8c53728dbb0
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting it's designed to host and distribute malicious content. The presence of a callback lure heuristic further supports the phishing attack pattern, aiming to trick users into contacting malicious actors under the guise of support or billing issues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9d7e7d38---79027060438.pdf In PDF document text
    • http://phongthuydotho.vn/upload/files/38314780880.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/fuxunurolejonigif.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/tisefepuselizobepok.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/60912752365.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16146456d50873---vorudurunuderevanasezunow.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9b53b19b3---sugajiganitofipuguninewo.pdfIn PDF document text
    • http://houselandia.ru/files/10801981603.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b45ae6c8ad---69306324120.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/puvimefulijub.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/10514842766.pdfIn PDF document text
    • http://www.f2dassociates.com/userfiles/file/bukusumoso.pdfIn PDF document text
    • https://rafautama.com/uploads/file/16281567660.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/kobanilikavetesurigiza.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/61926848264.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/wodaji.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab868a3b03---45988834872.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/zikukugoru.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/fifugojitikejiwimaridora.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/18360240093.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/numoninemamamude.pdfIn PDF document text
    • https://5udua.com/contents/files/buxuwedigizorewepidiro.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/vefulaw.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/pigesavabew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+oyun+y%C3%BCklePDF 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_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 10292 bytes
SHA-256: 7c361212d32b9d3f4b25d6b4acb11f016bd6b6dd0f49397d85f392c906bbb8e6
font_02_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 18604 bytes
SHA-256: 008ab22610604d3e31f4ba21a41128c79993afdb3e918a064994d85055f0158b

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