Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d76bf543b294755…

MALICIOUS

PDF

78.2 KB Created: 2021-09-03 17:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 725db2701f7a375cac43a39131bda5a1 SHA-1: 0b8cba7d3a3a40a58a45846fa97f8f0b6c065ff4 SHA-256: 5d76bf543b294755fbd8e0d139ee890ee1592c44b71721dc890e1472758a433c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is a primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=mediation+remediation+and+the+dynamics+of+cultural+memory+pdf PDF link annotation
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4vg2fta3ke2ot2d0mcgp2l6bt0/44049973787.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/0gcjlsadjklhmccsv5pba959vi/21822249467.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d93fcc326356eac8a15643f121f03cb5/55591258479.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/74195053794.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/912fc0181f921ef311843dfe729f2cd9/palumunoruzajimivip.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/topopikolijikaguvu.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/6691721049.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2sphrunsiuh6cqcq9bcnd9p00s/92241923414.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/359b870c6b5e36984746cb11113cdc89/69875086242.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/f1422eeedefe3ed16152486a89d422f7/vofejokuverajevufivezefew.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c86c86c9904---nupuxewisulo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607360c546692---33533602306.pdfIn PDF document text
    • http://chpcentre.com/files/file/zetewusaka.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/ba851765ae6f484a472f24c9eea86fcf/70298583964.pdfIn PDF document text
    • https://mfdesign.hu/files/file/sikoxexupimekowisodakux.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ov392gv9lbskq2qm15o0a4vdv4/15190467935.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d730c1cf29b53ae4f238adf24b0148f8/42517250955.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094033ecdde3---jozerakokitegusawalisezo.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/34373048924.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/74058631476.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/venesoja.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/noxikubasijiraxexirane.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///suruvevofojijuraloxano.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/dasabisijadunad.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a7acc6d8038d2d7418261de66171e926/7286566032.pdfIn 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_off0000c76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 11092 bytes
SHA-256: a4be060eb4b2918cd0a97010517040f5c4c05ab3bf2aaa5f501b8298ed80ea77
font_02_sfnt_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 19064 bytes
SHA-256: 35bb923d3bc251ba9e379b0a00c0bfe9e74aeb6d38c7fcb29fba8191cfcb88cb

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