Malicious PDF — malware analysis report

Static analysis result for SHA-256 f416b8d74718f2de…

MALICIOUS

PDF

66.0 KB Created: 2021-05-12 08:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14a1d3d60a1696edbd7b1f181d8c235e SHA-1: a54d57173fead7d202bdff0bd77b52690c7a7f8e SHA-256: f416b8d74718f2de64ab373e165d9e880b67cb0ca4f9ba646984a9a54187f4a1
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to distribute or host malicious content. Although no scripts were extracted, the presence of numerous external links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e4f36f87ceb1e4790621bc5991c0aa74/3854292322.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/343fa20eacdb57328ca282b723a38367/vasiwokubawupadapibonajo.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160703146e4f2b---27716155579.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/502b6b9089619f0904705e3e203effc2/pamogusuwuji.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c8980c5d6e83cfa3dd31cf89d8d6eb66/63042676199.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/7f9efd6f9ea4fc451be7c1b0e5143ffc/lakikirola.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/47387133542d10831a3542f8f832cc27/29415262579.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725d853c112---42715054016.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160979e82daf61---81212394714.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/6a3e90al7n6vsp0n64npshqugk/61308113276.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098e0873856c---36991382575.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/09c7af61b492e2c1185ece82a7d8f999/ziwedobozavumerepafotu.pdf
    • https://tecnibat.net/uploads/archivos/82665719339.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6138c3955---18646515058.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4j7sqkg5gn7flafm4uttstalae/vodep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=bleach+vs+naruto+3.+3+modded+apk
    • 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_off0000cc0c.bin
cfdbfd0be4b6bb023a02be47c76f35905062220fbd860b7260c93c4fa4af7d75
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0C 5680 bytes
font_01_sfnt_off0000df38.bin
bbc430772520555d9c4a9d18c710fca1af70a37764edc7db3acaf3b0914b2905
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 9360 bytes