Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa874e207e6f1567…

MALICIOUS

PDF

69.3 KB Created: 2021-09-17 13:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 768f816492c780ba16398bee81614ba5 SHA-1: f183340eeb15f2406f2416207549b61f3a7e704a SHA-256: fa874e207e6f1567d64ec40eb9ee6d9b7883b4002d6e0e27827ce32eb38a2e2c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to compromised CMS upload storage, suggesting it's part of a larger phishing infrastructure. Although no executable scripts were extracted, the presence of external URIs and the callback lure heuristic indicate an attempt to deceive the user into interacting with malicious content or services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/55606176371.pdf In PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/xanadibodofusenurexatowaz.pdfIn PDF document text
    • https://grnca.org/img/files/files/lokutupoguvilisen.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/46842982332.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402bfa86e48---36012134826.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/12793478063.pdfIn PDF document text
    • http://hexindechem.com/upload/files/sexiforigawadewuxa.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/mizugazanezetok.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/81787091960.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/85521099664.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/52807707855.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/sesexipeximewebo.pdfIn PDF document text
    • https://network-italia.com/file/tuxazukaxoju.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/voitlptcud403lr2mdv3udf9ng/bugeduwituzerizokif.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/74092865434.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/jibisu.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/23196430646.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/zofejonekarisovigesom.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/foxinat.pdfIn PDF document text
    • https://shidoremicrosys.com/media/98434914124.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/pixejinarazap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=move+chrome+bookmarks+to+another+computerPDF 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_off0000b0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E8 10892 bytes
SHA-256: 7840a8418357763cadb7321b83c58268eab34d65b02dfffd88bd1336471b9d52
font_01_sfnt_off0000c9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 14992 bytes
SHA-256: c7c3b2b4c2af7e0b52d93ec80c1c037a52c37ce031121ca3b25f704e5acee788

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