Malicious PDF — malware analysis report

Static analysis result for SHA-256 b312f10c2aa5f730…

MALICIOUS

PDF

89.8 KB Created: 2021-08-02 08:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 557fa4ca6eb106c2f35a709e8eb8c04c SHA-1: 41b72df952d5df256f3e188fc86245c345733962 SHA-256: b312f10c2aa5f730f5a0e7fe30bee721b90a75aa777c50aa961eb0450ef10312
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to obscure the final destination. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the presence of numerous external links indicates a redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://oncallanatomist.org/ckfinder/userfiles/files/pijuzuwizan.pdf In PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/zipawekusulosut.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/26381734267.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/92009388a6c98ae95202b4fcccf60779/ravilejofosixonugoto.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/78930190864.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c6e3a6711a859d9b69c020221779427f/26029084256.pdfIn PDF document text
    • http://amandamaitland.com/images/file/xuxivogupapanu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072df6637b1c---kuzizixirotogu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d9f59ff1---71246340119.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/87132869399.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078ad07b3a3d---rigelamorojopigamexid.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ab4fbc8ed634bb0fe65517f62133605a/96720266223.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/df666f1470c824d0fb4b4cdd72edbf99/34918014765.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/balotinudamedija.pdfIn PDF document text
    • http://voijin.com/userfiles/files/21852354655.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/02db3b5138ec1dc29f2853ad2922f305/72710810817.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d1c745124---sudulipoduxinesiniveto.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/97738399382.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/vijow.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/miguwifalo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608c52f88982d---81745556411.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072d183e54c0---92933644865.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfed634bdc---kugifananisupetopege.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/vapafijobumewapojikomumit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=m%C3%A9lange+homog%C3%A8ne+et+h%C3%A9t%C3%A9rog%C3%A8ne+exercices+cm1PDF 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_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 19004 bytes
SHA-256: d3c23c25fc199c33018ada2e8a05e6a393e5b20b4c0d053da23243571f7f070d
font_01_sfnt_off00012482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12482 11136 bytes
SHA-256: 6f6e12990a23ad4472e6d6cbbb0a4f1663b832597022960285903fd128536025
font_02_sfnt_off00013db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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