Malicious PDF — malware analysis report

Static analysis result for SHA-256 be50402c6291bf42…

MALICIOUS

PDF

73.0 KB Created: 2021-09-08 00:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf3a96f42ba2a1af0b6037b12a38d9a9 SHA-1: dd601fd1f390b3a4d208191c3c136e0d493ae1a7 SHA-256: be50402c6291bf42dd7a816471ab6aa328f99f3469fda9d52a83115ef08bd557
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. Heuristics indicate it's a link farm on disposable hosting and points to compromised CMS uploads. ClamAV and ML classifiers also flagged it as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://inwallendorf.de/userfiles/file/97522751522.pdf In PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/mugunagapudutilefaveve.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98ccd8544---kogekeregituk.pdfIn PDF document text
    • https://activepymes.com/pub/file/dogubomifolow.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/xuwipom.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/usg17td5jdig3f55jkhulkbk14/87543011507.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ccd136536fbd95fc6d543a8d91c9bb07/kafanisujafutibef.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88a4ec4c30---wonokotasewuxux.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/69271575087.pdfIn PDF document text
    • https://strechybenesov.cz/content/vumizinabamenusefasirumeb.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/f83feefb4abb3a86d696ae4cb52aefe0/moxusabegamuvux.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/jodivisamoxepurotijajabo.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/numatakudusofelarili.pdfIn PDF document text
    • http://dzbnf.com/upload/file///53330527973.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/2d8c2a4e18ce823803c9334d2b347650/vukibevamofipiza.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/takis.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/40547719625.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7fd5bf75d---vetexosikiguk.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/71547771228.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/42888551941.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/49002646767.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/xujexutiwamalopusujoduru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=aseptic+food+processing+pdfPDF 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_off0000b9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FE 10568 bytes
SHA-256: fc0e347d19cfcf6bca6be259f9f6630e0c1232e84bf30faf7e5beb09d5de48d5
font_01_sfnt_off0000d1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FF 17848 bytes
SHA-256: 80e41fede753bfa942290aec34e4bc7e9813a9a65bcd8351e35b328ef312243c
font_02_sfnt_off0000fe53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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