Malicious PDF — malware analysis report

Static analysis result for SHA-256 348685ebc2d6ca2a…

MALICIOUS

PDF

75.2 KB Created: 2021-09-04 05:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d9fbb61cb348490acb62b5faca7efee SHA-1: 0359349af75f25c7a22711d79aac3c61ea797d21 SHA-256: 348685ebc2d6ca2ae0c5134da5a85263782421a46bb2922de51f21c35c34d2b8
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the presence of many links to compromised CMS uploads and disposable hosting reinforces the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://drafthe.ru/uplcv?utm_term=parkinson+pdf+libros PDF link annotation
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/piboreputilazurixut.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7539c0eb4---xusavefekulirufasolid.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/faninelapimoje.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/futurofoxifonabusumifujij.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161245e7da65ec---36137815812.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/dirazamubobavunowugujiw.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/48a7f43ce218910756a22ba82cac71f5/37804851216.pdfIn PDF document text
    • https://asi-filter.pl/files/file/gosiwin.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c00d81f1389---mijikavinaseji.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c1230d7f27ae561daa3ca98cbad04a3d/44816153215.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a0067a4b---24827080585.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/6d5626c0d3e11cdbd646d7f4b198bd98/joniwegazonotejari.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/511kclnb8c941rcii58kcailhj/xojovibaxudojupibax.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076f03831683---22257065344.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/977038937.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/81461471235.pdfIn PDF document text
    • http://leton.pl/userfiles/file/vegoxalibajovadamexusilij.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d0c1d0f9b---kopevonebabofadobidog.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/bepogu.pdfIn PDF document text
    • http://soc-in.com/data/media/files/17885872032.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/48782851677.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160983fb32ea64---59781756386.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/150bdb0db10bfa81a207468cf6a7de21/dujuzixakuw.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/naririzugud.pdfIn PDF document text
    • https://chp-travel.ir/data/file/7002670335.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ecfd6057a24---30873353444.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f70459078---visoruwerifoxizajekitore.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_off0000c191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 17768 bytes
SHA-256: cf4f18bef511a9e9dbfc42db6ea1c84e30a781d7bbf10c325c004e6426b20937
font_02_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 10492 bytes
SHA-256: 334ad1cfb939120d82a188765630e676fa6bb84360f0b70b84ff937f4d63ace8

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