Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d61e95151b3e67…

MALICIOUS

PDF

80.9 KB Created: 2021-06-25 16:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 914e879f7b7c974b39edd4a4699c0796 SHA-1: 3807eaa89638e58b28c01a13a01b1dfcb8b74f8c SHA-256: 42d61e95151b3e671144feca408007d8bd8cf8e596318b165ac01a083eada4cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to compromised WordPress sites, which is a common tactic for phishing or distributing further malware. The presence of numerous links to potentially compromised CMS upload directories reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fcc12a315---53237911265.pdf In PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/f640171daa64c4682bfd0abfd0dc1b62/dedipiwakalagad.pdfIn PDF document text
    • https://ive-cal.it/file/38130879424.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/4972083415.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/669959b9eb2fea9b4d2e2d327d0ed54e/dinadu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acc78748e7a---69180379738.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/peluzovafalubexatupabumi.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784b4f107c6---48983894482.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/pibolisazikoxezawusir.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/gupinubejodajepemajezixet.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cff6ae34717---vufekadamita.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/daa812ffce7142b603f3a10c47a18a7c/sisisipoxarugopevez.pdfIn PDF document text
    • https://csodamalom.hu/files/files/66156806282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=spinal+atrophy+type+1PDF link annotation
    • https://medlineplus.gov/genetics/condition/spinal-muscular-atrophy-with-respiratIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDA 10420 bytes
SHA-256: cf458b4c0068c3e14a3a0a23ee69e2de545e47cf9ae2a26e485642f9d3a033d5
font_01_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 16972 bytes
SHA-256: 91c9d46e4e7e98fb7169976a7553042de0ce9259568021db475898bf3a66479d
font_02_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.