Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c875a91d142c67…

MALICIOUS

PDF

75.6 KB Created: 2021-07-02 21:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13a3db48b1735ea1f0c1314ef526bdb1 SHA-1: 1872dc9840a30abf2a6b057033f289da7564858e SHA-256: f1c875a91d142c67fc1b7fe651affa220e08964287d71239d15c296ca021336c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://chcial.ru/uplcv?utm_term=synthesis+of+plasma+proteins+is+a+major+function+of+the
    • https://hanurichurch.org/ckfinder/userfiles/files/lusidajox.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/22a160e4894d73ec2ce8c3d04fae79f6/60078091491.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8dc6759b32074309830021293cec42ed/xisoxisoliludogikor.pdf
    • https://aradmissions.com/ci/userfiles/files/24142111133.pdf
    • http://softwarefactory.nl/images/file/pagaguzuwafixavijukijuse.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9001ee8d2---74806873183.pdf
    • http://msiutilities.biz/documents/rawepimedebitij.pdf
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/mogaxofowevupekefolajusa.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2eeop6jvnnsqtia6e8f3vlq6b2/xudevafijetulafoxez.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/mudodusugakokuxutipeguros.pdf
    • http://influences-vegetales.eu/assets/Image//files/kepizid.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b80897cef41a077036086ed9792a883d/96535425700.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/0gd1u2k35a5f9m9asiis4r3c36/95742544672.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b7310810---firasivusetorelegotebela.pdf
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/f4d13dd6148d8a8cae542264e84e5d1a/89707434419.pdf
    • http://pathtojanna.com/userfiles/files/66840748240.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/at10psr3je7gahv8n6ja2u55bo/92564412713.pdf
    • http://ddservice-bmw.pl/userfiles/file/19906005948.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/q5gmd3mt2a1enunoggfgflsr4f/24483211335.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607045570648a---mawutajobu.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/c25d62ce834c603c5db7dac5983de699/3271602936.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/444725c7adb54e8b90457418de9fce9b/pinikirogasopapos.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160757e06d9cd0---14646666936.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/4adc266faca254d8c42ff59d5a127ce8/putupuzidenanawa.pdf
    • http://talleresjpg.es/img/file/zepaw.pdf
    • 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_off0000c68d.bin
33dda02ae5556cd8970395e5e80fb40d7a58a5b7ad5c9f4192bd0bebc8463e97
pdf-font-stream PDF embedded font (sfnt) at offset 0xC68D 15656 bytes
font_01_sfnt_off0000eecf.bin
b0ced7d49c566d88d6527a00f2af5b9ea5255dcd02a78dd367d582f236623dc8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 11164 bytes
font_02_sfnt_off000108b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 16792 bytes