Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5cb2627b83f048…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 07:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3005011e9607aa3739c8e790c60de94 SHA-1: 7ee875ca0364757dc582cec1772cdd731ee99c83 SHA-256: 3c5cb2627b83f048f328795ac0795f23e4af6f7498cb45cfb7660877c864e622
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as a phishing trojan by ClamAV and ML classifiers. It contains a link farm pointing to various PDF files hosted on compromised CMS uploads and disposable domains, suggesting an attempt to distribute malicious content or phish for information. The presence of external URIs and a link farm indicates a likely spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://olympicwroclaw.pl/zdjecia/fck/file/297444303.pdf In PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612959a163d8d---53297869826.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/vesenebizolidulogexa.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/hioj32vc212ev89c535fqq3igj/37121788959.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/dapemavarokej.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/59325108656.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/vuxasuzunoxexa.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/joferexebaposafafikajo.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e05ba509da1---40273324305.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/e1d36b7cba0337b138b91318e1328d9b/mozuri.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/51956345925.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/77273906771.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8725d92296301532e5689674d3230f5/donoxuwijis.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f8bb2c5c328---zusetavogufagoxedir.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/63090190744.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754464e7501---6018397608.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/44644795098.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/44e073c37eb24fd96c66ef8deb242dda/73806065286.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4e671a4a10c31dfba6750ef964ad70b7/71924815164.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/36f3a32581249cf739ae20d031a281b7/zovinemububu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/e60e4aobree0s63ehj8e46l9hf/zoniziv.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/88610706259.pdfIn PDF document text
    • http://sbcnepal.com/images/file/vejolijulebupelovuxuziji.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/96321898410.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/22832514208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=curriculum+vitae+basico+pdf+para+llenarPDF 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_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 11120 bytes
SHA-256: 8c7c53ebcce793062e4eb5675f2588823959c69de1f742bea46e727b2717435c
font_01_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 17168 bytes
SHA-256: ccf4002a77a925b91ef701b60bb975c90541f642e78823a5bf5fb3355f17f20c
font_02_sfnt_off00011f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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