Malicious PDF — malware analysis report

Static analysis result for SHA-256 800c362a23c61743…

MALICIOUS

PDF

71.5 KB Created: 2021-05-16 08:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b18bad65a614c51671cb1bfbc6e58a03 SHA-1: cdcbff61a1bcd4dd7fac5d99786276990e5a99b6 SHA-256: 800c362a23c61743215bbe43350da7e2ba9bd6b2d491157a307b5923e88aa092
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's upload directory. This structure is indicative of a link farm designed to obscure the true destination or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8ead54224---91522448817.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607460c58d4ff---zutob.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078df0920cbc---99721223231.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6033f2beaa8953a9e02f789d6f6b2cc6/bomejejugexokaxunamur.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e563bb2f83---fobezuluv.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715c703416e---tizexibenelet.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f3aedf5af---98523635648.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/0d68637e95f10552cb85c8ed8f65afa1/remopuzaxejaxesukufuvenik.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/k26gt6l8shb2tkaek5spovtupv/gugebirigalekinuteris.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929b85e9945---jepoziredaboneje.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087716c4004e---pefajifedexaxapu.pdf
    • http://sotel-perm.ru/site/file/zubumenupadus.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd68499174---12366375903.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/jp7mavfdjk80mfj2ala47vndnk/rawagapexatoniru.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/02a09b72452caf489f7dfc56c17e17af/44671191572.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=simple+admin+panel+template+html+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e195.bin
b186a7f396ffdbbfbcff04aaef8d6e8c577600d8ef987e6abfbee4840ed3565b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 5208 bytes
font_01_sfnt_off0000f31e.bin
68f0c74eeed784b6c64f27fbf8c232b50a79a404797024913be28907e8742f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 10064 bytes

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