Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c4e6384b61d3c4…

MALICIOUS

PDF

88.7 KB Created: 2021-07-23 20:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d446c63d4560a1916093eb628da07430 SHA-1: 792953efd792763b2c6bebd92366161f47cd2451 SHA-256: 97c4e6384b61d3c46956bc30e1f9f7597db169a5655f686569e2eef7bb67e1bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://lucann.com/Upload/file/66133413807.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3cb614a8f---jumagovowafilowuso.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d0a795389---67980589558.pdf
    • http://castrolmintabolt.hu/images/upload/file/dopasemisuvojemakoba.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094f5778f8c4---kenapi.pdf
    • http://j1medical.com/uploaded/file/sewetoxabi.pdf
    • http://cedule-plachty.cz/files/file/xunupowuxixuliwoga.pdf
    • http://angeladaniel.eu/uploads/files/34987593214.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ba4e36cfa---88790588057.pdf
    • http://universe-micro.com/upload/files/20210623_040026.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/n2553q6sip4uj8thprr589fgc2/xomujezixuxivuxurirof.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/31469581081.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0fc14c5e9e3a4e5764ea3742fc055011/pasezosemevonidaluvawif.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3dc24795bcf04e83abea5dd7eb5c2a5f/kekoranibat.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5mui0hfg42keldfdbn3grqo1j2/837419176.pdf
    • http://imaginove.eu/data/Files/98389852988.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089929aa8773---69597350382.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/sinotalakadokigigalasoru.pdf
    • http://euredit-editions.com/userfiles/file/55766060807.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b4925dfee---remeloge.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9406370ec4---fefuzekavuzijetoj.pdf
    • https://ipic.vn/userfiles/file/dubasuwami.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a697305164c---vosidet.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=citizen+eco+drive+skyhawk+blue+angels+manual
    • 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_off0000f23b.bin
fb18a60bc23301cf3ea8f5526a7e15c4cc7ed9e5dfac2e6c1bc5ca5c8e2d3bd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 17920 bytes
font_01_sfnt_off0001211b.bin
b0c639e270f7ada6b4d497ed2b339789279f735804fa1ae7f763a52e1bde08f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 11508 bytes
font_02_sfnt_off00013c1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1E 16792 bytes