Malicious PDF — malware analysis report

Static analysis result for SHA-256 259426bb1d927e4e…

MALICIOUS

PDF

88.3 KB Created: 2021-06-30 17:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba01eb590cccf328f61591838a4b5282 SHA-1: a56c6ed209701a5d3eb46eb3f4f3df4ec340fed9 SHA-256: 259426bb1d927e4ef80a865ad9b83ee612d5c2f79d07d8e4c116227b2d3e682f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://epmachine.ru/d/files/gowinikosoz.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/af992264f58cd6cde01280bd4fd7ab23/vujojutos.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/tefikabatarunu.pdf
    • https://wrd13.com/force/file/16872495881.pdf
    • https://actor-conseil.com/files/file/86711185153.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe302b70d5---sulilujixusukuzodotod.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/jd68unb5o8ini3k05aj9unfkdg/7700574060.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1e24661a6237fa440b517bdac163b0a7/vilesetekafigujusenejus.pdf
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/97386983566.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210601235135.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d29d0e102f---15225237759.pdf
    • https://arichaindia.com/userfiles/file/nuwimilaxugusut.pdf
    • https://prtl.pl/userfiles/file/tedixiki.pdf
    • http://szentistvanpatika.hu/upload/file/80473486049.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073365457b3d---fipufexukumenibizulexukug.pdf
    • http://yomamasushitogo.com/uploads/files/poxazegapezajenur.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/52bbb3e830a9df286b7becadc1c67c51/dufubiwenekoruf.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c06c6c665---30824353984.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9cd8984f25f6a24e23108e98b5700d4/59605378547.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086c46c992c8---werudopezivixurizideku.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/6a0b8a2e127d081bce87e83b524382e1/fejalitabekipopadivi.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/70826333360.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/4440268233f9205b53d05f85ef34eeb6/jovaxu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=new+normal+learning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f98f.bin
083dd60d1f7de201e596ea5927d001314b5dafb9c48c5a4a8ccb398811b52dba
pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 16896 bytes
font_01_sfnt_off00012554.bin
384673db9f642e5fa651f758170390efee295d0d51a698a815f2a2c6023a5c82
pdf-font-stream PDF embedded font (sfnt) at offset 0x12554 10248 bytes
font_02_sfnt_off00013c54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C54 16792 bytes