Malicious PDF — malware analysis report

Static analysis result for SHA-256 f033098319e7d46c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 11:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6b8553f87965de004ddfceaaf77699c SHA-1: eabbb73e725d15f2c7b339b7aca1d7b59e7cbb51 SHA-256: f033098319e7d46c4adf032584b3eeeb146ef324fc8bb7fb89e3632d23d322e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy on disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

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://synerhu.ru/uplcv?utm_term=android+1+dude+theft+wars PDF link annotation
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161f79426e---86063196741.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/9208839567.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/48949730106.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/70599741731.pdfIn PDF document text
    • https://cargobull.cz/res/file/93779471660.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/28709960454.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/90633948981.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/bodisedudimavolimemedevi.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/gasajixagepijazav.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/tazaralenanabiw.pdfIn PDF document text
    • http://champagne-ardenne.annuaire-regional.com/ckfinder/userfiles/files/21471780238.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/24733633534.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/tubizezosokoxafenoxijik.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/31071470580.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/jagitoje.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/xakowanafeg.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc957f65c---wolud.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/fewunusuwaforogowi.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/87682640354.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7d39c2283---lozerewosopinekumos.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/31520235377.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/43546132684.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614184c818619---2410698731.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/20932941186.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/jubenuseb.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_off0000b46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7F 15928 bytes
SHA-256: 3476008370539864e010db23da7deeb6203168c71aed456e561451135444946a
font_02_sfnt_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 10624 bytes
SHA-256: a9de82f89db11fb94b095a9d6dda3e51189914edf0dfbc006edb58728a9a99e2

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