Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bbdc7b2a9c06a3…

MALICIOUS

PDF

121.4 KB Created: 2021-07-29 20:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 13847cab20a8795c586bdb6e32a7a7a5 SHA-1: ca3d343208b164b05161440770a93589608976b2 SHA-256: 13bbdc7b2a9c06a3ecdb03a0261bae4daaa25784cad294330e597ca8c2d29c9f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the extensive link farm is sufficient evidence of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://oniceh.ru/uplcv?utm_term=can+a+pentagon+have+unequal+sides PDF link annotation
    • http://geteffective.biz/uploadfiles/file/32864477218.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/21d3d71f28cc06dcaf312eaa257d4bde/27575867073.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/c3fdf33ffe51451f6894022e4f4b4a42/91557742926.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/55068183844.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f603855cea44c394e5893f07cca241e2/japigavar.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/damuvaxumetezagavelimo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16071365e5743c---78554901098.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072159f463ad---7479089903.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b779ce91348---pepenofidekunoxi.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/0ovfc8olemni58bebi46sacsg1/dokeb.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6b2ed444b494a51b9ea43926f30c6327/razatetaxobexakajuzodavow.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/felenob.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/23320841764.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/kokegemuso.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/ledidetuwapulasax.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/dukagawewitugapalepaw.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ac90755092fdccff2cfe291c5e45e0f5/93315477234.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609303bd06fa4---vedirativekoketig.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6890be32a2---fatalexejomotamivorewu.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/bagetixoxepupozivedinovew.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/52563275095.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/latirelatapikupitud.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16094c06f671aa---16606778998.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_off000168ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18100 22076 bytes
SHA-256: 163e7c62843abd02390ef059b1de7604861422f04f486aef4e02f6e6b4d2de25
font_02_sfnt_off0001bcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCC1 10916 bytes
SHA-256: 4f3e23e963cab31bee0660f5d077544ae5d96a828e55a3cb8692438453d2466b

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