Malicious PDF — malware analysis report

Static analysis result for SHA-256 31146fb1ceaf6742…

MALICIOUS

PDF

86.5 KB Created: 2021-05-10 05:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc2bebd6f513c8eb8c481b7a2d5063e9 SHA-1: 1f75a3df06f80ee9d14781c8e6ffed4c14252f7d SHA-256: 31146fb1ceaf67426291d88f3e7ede1490d1ad0139cddc60eea55bd01ea5cad2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting file upload functionalities within plugins like FormCraft and Super Forms. These links likely serve as a distribution point for malicious content, as indicated by the ClamAV detection and ML classifier flagging it as malicious. The presence of external URIs and link farms suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160877ff098efa---mamowibadusanor.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ro4h2hr8ko0b2l60tvaa5ep23m/91963130043.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a927db25c5---28638342180.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f81d76e2f2984c397d11b8912588817/fosovuvewuwaligonad.pdf
    • https://isosklo.cz./uploads/datisu.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079712122228---fijet.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4a99a612915ed6c8f6cb7ef823cdb5d3/78334399393.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/69d68894e81199b57743c9e45c7097fe/71798563465.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/5e98687d29bae7d2fe8c4f0a63ffbba9/gifumodigupom.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607de73d3540b---19214896575.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/t5hbbka5kot5i6nnu0sdolrjv4/87794705804.pdf
    • https://aravlicraft.com/cmsCart//upload/file/bitunagazipavo.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160820c05d86aa---68088983890.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/fde2d9d08029d8fba922899cba326956/jeruxolix.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/7er2ltdm93b4uh00q3nq88hqb5/97786524092.pdf
    • http://mousike.it/img_ins/files/80503912534.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=brother+printer+utility+software
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001071c.bin
30ab6f4983f95831a3eb109b51d59c4956e07f0e24f84063eb3e6b967076d254
pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 5116 bytes
font_01_sfnt_off0001188f.bin
a81dec6f37bf94a0e2dfcc48a7cf7d26b9037f6d0a00b765cb48095cee61e23d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1188F 11196 bytes
font_02_sfnt_off00013e8e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8E 4324 bytes