Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25407e91dccfc68…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 19:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f7ebe2f8bf5891292fc39f33509bb18 SHA-1: 9646ef8ec0bbb02d46d7c33181037d0de771d345 SHA-256: b25407e91dccfc687948809596576d53907ddd194bc364eef13ca776d5d2be4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=canape+recipe+book+pdf PDF link annotation
    • http://ekotop.eu/userfiles/file/1065585794.pdfIn PDF document text
    • https://cavalier-king-charles-spaniel.ch/userfiles/file/zulufulujiziletumo.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/nokopalofukoba.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/wunojabumanasibavubujez.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/plkm5tc45dseuh5ms9f5f0l7t4/xojopopelilomur.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xejuzorununadozule.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/xobolumavapisanikepilel.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dda95eb118---8518614578.pdfIn PDF document text
    • http://coatsofarms.com.au/ckfinder/userfiles/files/velexanisudanenunuki.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/zeregato.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076092d25aec---penukivajo.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/53984012807.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/b98a717f44dca53c5b931ea56cae3bfb/21423228963.pdfIn PDF document text
    • http://vo23.ru/upload/file/vunenewefilutidukirisi.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/27468199736.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/jilefufejajimetetokiweto.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791ceb62450---49610928176.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/3eralrhunmk6gpl2hk2o8t5frj/77279060888.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210704182919.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9b3628f39---leseralelujikuk.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/safivekexarogikepokun.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/pawin.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b19bfea5---rigosagifaxexajoketubixi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/3l8uppgu4748va8q5buc6kmgkc/bebetiziwasumixurabiduper.pdfIn PDF document text
    • http://seamacros.com/upload/file/7361431726.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_off0000d360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 18580 bytes
SHA-256: 32ff3859592c9fa16165ffa3f72945aeb4bb4aa18c5d2c1f44e4dde85c6cb630
font_02_sfnt_off00011bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB9 10564 bytes
SHA-256: f5cb86fa18e373028b30b43f0a4939165b797d89237ae1deae873e684e29504f