Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e4f313a549f96c…

MALICIOUS

PDF

95.5 KB Created: 2021-09-05 11:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a22c0b4d5db17cf156840d510cb5274f SHA-1: c8f4e411d5eb08f2840996b7be01b24ea93c0a35 SHA-256: c8e4f313a549f96c8d123b05e0fde8b408bcb297f8e3acc66b93c7cd48d618f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a28a954a1---14684309985.pdf, are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161215b27d07d3---lejepusosarunanezisuv.pdf In PDF document text
    • http://bagiez.com/userfiles/file/34220987460.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3bd2a4fbe---beruzidive.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/20427664670.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/tovuxuwaruxe.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/54329172015.pdfIn PDF document text
    • https://etimes.mn/uploads/files/davoxo.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/bawepasizudidezuwe.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7479a8e3e5526caa72aca12d7877928a/doliredaduwuxasafe.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/17ecf0a4077883f991ad54f3e3548d21/54560372557.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbec131f43---tudivawezozizepuxan.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e9eb16dd08---22848170120.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a28a954a1---14684309985.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/79817256504.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/sur72jprjpq3vi6g2l1so60sr2/sowugaropibetuturonuzeso.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e6f3d1cde---wuxepep.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608d382c8d102---xedifukexufewufukuxuto.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/roxatulalemokorifi.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/lasolanunofonasaninex.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/ziretefevudizimolemoma.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/meloxi.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8796b9ab120ed201eea93e3c42260bcc/2912919667.pdfIn PDF document text
    • http://topflexsports.com/uploads/nedizokosunojojatafowor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=electron+configuration+of+ions+worksheet+answersPDF 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_off00010ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126ED 10876 bytes
SHA-256: fa72770e1d2815e54008b1b1f3c372b645aa6b55b5cd364e9f673f56e987b5c0
font_02_sfnt_off00014012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14012 18436 bytes
SHA-256: 655285bc01bbc5a6673414026002022553ab13bf22760191b74114951b7e999d

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