Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b536a906907f52…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 10:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9d8ed32840a767a9f691a95d13460394 SHA-1: 58b3dd0360a91497fb0f41f06a279b2512347d5a SHA-256: f7b536a906907f52696994c16227ce4b909484d4e848568d8f263cfd97d5f9ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous websites, many of which appear to be compromised or disposable, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cructi.ru/uplcv?utm_term=pdf+to+word+converter+edit+text+online PDF link annotation
    • http://giaodantanthaison.com/Images_upload/files/nepulev.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f83c4a6866596bec659090a693bb5883/sebuzasolepuzolekoraki.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/12891215873.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/74083987999.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160948a1bb6898---sonitefuji.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/98996821558.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/11162105119.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/88959253445.pdfIn PDF document text
    • http://minipit.com/data/files/51477478908.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/45825414469.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be62144d3c---gofivazivisumu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f02525d5d50---towurarajopazufimitogezi.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2af0d5f04---68258335896.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/38542173967.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/lozizure.pdfIn PDF document text
    • https://ikima.fr/uploads/file/kemosopijukobisekiwevi.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/a28b5066b8fbc84566a2c715e7a368e9/fufumido.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/96880750481.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/buzafuv.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/6iv6g0ue0b088rrak6fnfnfe5p/mewevasawijedilaf.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/3326973239.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebe9eacc9c---mowukegutuxusinadinabina.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/kokutezewawoxawawuvu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3e7ba91ae---faxemufuwuvizule.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hgdsu0krs57bl597h1gnpkf1m7/tilekenoborewesidadug.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/zudegozuvituponavezu.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_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 17760 bytes
SHA-256: ad803cc5bee0850ebf91527c1a9652491479cf76ffe76ecbec2e39e80b133ec7
font_01_sfnt_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADE 10396 bytes
SHA-256: 7d53d4be67d0fe575bbecbdf462c9894bb76d5adf0fac5a023bda219643f2789

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