Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d7fefa5827c65e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 11:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58edf5b7b2b41fc87e914ddc0d022dd3 SHA-1: d6c9635e005c2f6f67a68622c76f93721e537eb6 SHA-256: 13d7fefa5827c65edf130a9e51f271f23fe98c991385247b8794d552c3b7be3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories, suggests the PDF is designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that this document is part of a link farm designed to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/p040q9g6habpejot07polqnh33/57055283223.pdf In PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160702cdd72a05---bijefobepig.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/6p8pot4c1tvu1r0pat4mnqudv7/powarox.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/08f11a5d7f58413b716a9fec51477d2f/18921566096.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/17285572431.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/savirir.pdfIn PDF document text
    • http://888chji.com/userfiles/files/nuboretevivojixefug.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aee1525ce---litupelerobiko.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/xaluvavugolofe.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e57cab532cd---32901332243.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/xexewasotijatoribedizi.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/15d2e2d6592302d3fa4d85a6f6bce0f9/puwinuli.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/33464343712.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/46543318289.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/novawogowofawa.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/67244955075.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/46467551777.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/razatiligokam.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/77737984148.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0046422b5---60912418901.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887d3b44db4---25994159416.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ceab4ddd8---jewubojafupowuzorido.pdfIn PDF document text
    • https://basisnomor.com/contents//files/bokotuviseder.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/252ad267461dcd1046fde440bce91471/dujewiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=rogue+galaxy+strategy+guide+pdfPDF 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_off0000d8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E6 10932 bytes
SHA-256: 74d2c1539e20ddecfa8393a96d170910386d0f2e75bba1cd4de5cf23c32e1d36
font_01_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 18140 bytes
SHA-256: f1a2c274343873f740416c3683247ea20df256fbd2f12941f80af006781de6bd
font_02_sfnt_off00012161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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