Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c18811bbeaf369e…

MALICIOUS

PDF

91.5 KB Created: 2021-08-07 02:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3a20ec22662f2a4e5b7a42149f94185 SHA-1: 54aceb2dbb26499e03e43ad56e5dbf0d29c451a2 SHA-256: 9c18811bbeaf369e11665227dc502f2566f3f183ff30d0ac780554ab8b8e7290
156 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 or scam lure. It contains numerous external URIs and link farm patterns, suggesting redirection to potentially malicious websites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=samsung+vrt+front+load+washer+not+spinning PDF link annotation
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/2806422340.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/rasaviwutimupu.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/ginopopuguxirozokafisis.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/vilaxame.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ctofg7ch4nnm4m8opk1bkeltu6/28508191099.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/16334732787.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/lajofi.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/jomamazutatalalikoratus.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/lilokarebejufixuvusi.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/48263148811.pdfIn PDF document text
    • https://saporidelletnastore.it/file/53137424391.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/soleliniwaki.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/88800672332.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/binijefogazufowaluzerus.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/089d621a6e96eb145372fe353cdb75d8/39202247850.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/wutofimopigolosumufima.pdfIn PDF document text
    • https://clinicaveterinariacabianca.it/file/94796089955.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/li2t94q4tdvrquf1i4b5j7crb0/86660645408.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf579ab44---xupaxoko.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/60420307129.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/fc272b65ak1q4jupj0ddhlvu08/47280737395.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de65bc7efe5---xubenomenugi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/46524908102.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ca8633c9---21132983401.pdfIn PDF document text
    • 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_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 16796 bytes
SHA-256: c431aac07f9e81f1ce380d0ba2f3365de51386d411fe75d6bbb7bff8f5c4760e
font_01_sfnt_off00012c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C43 11272 bytes
SHA-256: 8a460d930349b30418c637bf55440c438ce8d7f1b441ce0e6c33555f2476c64a
font_02_sfnt_off00014655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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