Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1837f94422a60b…

MALICIOUS

PDF

88.4 KB Created: 2021-07-08 06:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: da9b209a0cf5282d4fc0d49d9a56b5a5 SHA-1: 009967184b5b9b831091db105619d04db60f4765 SHA-256: bf1837f94422a60bca07384a76cd945549722a1be52bddeeb6a852cb7a447a21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://chcial.ru/uplcv?utm_term=what+is+cold+front+and+warm+front PDF link annotation
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4c53c27ece50033921419d7f4482e01e/10757818867.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/51faoopbkptjbkid8fgudp4gst/tikukovab.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/94414529100.pdfIn PDF document text
    • http://djapm.com/userfiles/file/97553317179.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/jamajawezivuloberejuf.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/186h310vhnkl3vo55b654c0f77/tatudekavekedupasimeteton.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/musizesimefusadinetoj.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/41628618602.pdfIn PDF document text
    • https://chptravel.ir/data/file/tixujusiwexozuxid.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084df4a0f6a9---pofewebulakobima.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02268e3eeb---saxes.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/zamotiroraze.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cfacbb3a1e796d7e7af3f7f3abe3ab19/37167978199.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/8ab62bbcbdab7102542dd6107afd7c4b/95183856713.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d61683ed3e7---34754140311.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/bafosinekuroloroxalut.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb40473197---dowujuwunuzije.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/bogeruruxajemuratume.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b64616391dd---fefugexasip.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boxejuzerafodumopupiporen.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ari4hmvs8onb3b6usmqqd4cau7/patofenozen.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6adae5ba7---nisumuzamow.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/64288428940.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_off0000f665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 16780 bytes
SHA-256: 4d6a8b089270072655c9f8cd652a21c592284756201b07e16b79f275d53f6236
font_01_sfnt_off00012224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12224 10688 bytes
SHA-256: f2236163a75449d79fcf73c8d9a14210f59e6b9b962908ee4194f9527178b909
font_02_sfnt_off00013a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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