Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6f7bf7bd85ac73…

MALICIOUS

PDF

80.4 KB Created: 2021-09-24 09:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc4d05fee3bf1a2e6bfaefda0278b7f3 SHA-1: 0b34681792288d0e5250072f731752071d25958a SHA-256: ff6f7bf7bd85ac73a9ea5a972bd0d0bacf5ea2a3f6e0888d4803fe4621b073f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to act as a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://catamma.ru/uplcv?utm_term=file+manager+mod PDF link annotation
    • http://macabrey-luthier.fr/data/Files/zutada.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/79010831538.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/94252673929.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/poren.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8a5bab936---57722806067.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/63563086618.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/51132564281.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-19/20210919015058630552.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161425a81149c3---ripenapapedubasafip.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/21837736299.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/10407352294.pdfIn PDF document text
    • http://c-six.it/userfiles/files/jeganura.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/50016318238.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/77825787467.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/41483052230.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/sekijewemejavov.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/67872975494.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/76de98979a1e1f96f4a23a618bb13b1c/gifeguxabazi.pdfIn PDF document text
    • https://nistd.in/userfiles/file/86661813599.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/nekezuki.pdfIn PDF document text
    • http://simoncaulkin.com/images/fifisogor.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ebbdef21357d87e847d96bdefd9f7d90/52010661147.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/48658768643.pdfIn PDF document text
    • http://apicn.net/upload/files/85716044432.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/90342652620.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/u9rsvqdd9q7t1ib3qv26j4jvq3/51162551879.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_off0000d960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 16756 bytes
SHA-256: 0219620f7f1f6063d99f2047f54b0112a01f9cc7dec74ea811fcd7058549e7ee
font_02_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 10300 bytes
SHA-256: d3ad92efcb0122b295468014b8d33fb1675a9938b51b7f9bc880472e0a907e3f

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