Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f89aade908562a9…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 22:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a1eba9be36d244c661faa087a7894a8d SHA-1: 956447ad4070415307ee8ea32d19b035778e5240 SHA-256: 3f89aade908562a9c806805b5767c9ea9aebcc9042c5c1c09ef459f765395ff4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of distributing malicious content through these external links. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=lobulated+mass+in+lung PDF link annotation
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8d4a3092f---nutasef.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/lagudumivotesajaxod.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/95773705107.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/gexonobexowakodi.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081e3800ead7---50093716709.pdfIn PDF document text
    • http://393citizen.com/upload/files/76028679555.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/34595075279.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/83071205707.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/tufuvigigazewafamumopa.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/53019622267.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4160b9ca54---gexaturofezi.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/kekudatejapufeleve.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/73950089360.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/tujemilulotumi.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210624051443.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/fivulemejukedi.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607635c138c08---fegosanipifaxomajasumuli.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/63de98c693c3dc7d4d46d3f45ab4ea56/85936742465.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/34089420002.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/22291743686.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210813165416_2078116936.pdfIn PDF document text
    • https://kham.vn/userfiles/file/38008701461.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/3486764795.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/lavaw.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/gavixijutaj.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_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 10688 bytes
SHA-256: 4746c74f04261a257cea281061acb8455743ae6c4f54099dbb2642ac9db7dcfe
font_02_sfnt_off00011785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11785 15808 bytes
SHA-256: 9278bd86cda2b4b0a741a1021a62dafc0b204d4ebfafcba9dbb1e0c55973e0f7

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