Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cef52d6fe55f4db…

MALICIOUS

PDF

90.0 KB Created: 2021-06-30 05:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 097b073e071b8963e5f6d64b25d4fdb5 SHA-1: e52c5e4df250e9ac81a86a321263ec91690745ac SHA-256: 4cef52d6fe55f4db23024a1f58fbbcd9582291c4877ca075ac1566b4ba89412b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the overall structure and URL analysis strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/rr1e1k3jorv2ujefit9frm1tc5/lerogolivurowafigiwop.pdf
    • http://geyikkimya.com/userfiles/upload/file/63929544652.pdf
    • http://detikakdeti.ru/img/file/retagavitibefakar.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6d1213a458bf40b5adf8dbcd2e37d8c2/fovopibuvezegel.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/ed4aafafd35af92f8a67c3003613ab92/guwopozogovem.pdf
    • https://zionapostolicministries.org/uploads/file/muzefakikedewiniwip.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/c90ed763c8507fd6627a404996313181/36773597157.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/72581930640.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ecfc1b48428b42f1ecdabf0cbccb1f2c/86135997808.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/64aea83d70d31214e03949abba1c6a57/mogipebesepawejovulogewev.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/92639b956b0eb615f61037d7dae5d25d/jovanatota.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0e35911a---37130226924.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8548b976e---9953427230.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/lcediurg2dn15rjiinnk8heeu6/13011445838.pdf
    • http://zxpgw.com/userfiles/file/gubogerodexebibunusez.pdf
    • https://autotrans911.com/thread/admin/uploads/file/29829681596.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609677958b37f---jiduwojilexoworezelut.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/64288370384.pdf
    • http://gagutp.com/sa_upload/userfiles/file/20210515082829.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7ac278ed6---43516492937.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803bbf17f1a---temeziberis.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d5870ad5---49672729497.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cause+of+nose+bleeding+in+adults
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 16792 bytes
font_01_sfnt_off0001156e.bin
2750993ea04746ec960708786d123dcf39ed0b054f54238020adcf11ad011577
pdf-font-stream PDF embedded font (sfnt) at offset 0x1156E 17256 bytes
font_02_sfnt_off000142a1.bin
37eaf10ba811913565564cccd0844aaf4276a9756b9ed5d5627a6ba76105b085
pdf-font-stream PDF embedded font (sfnt) at offset 0x142A1 10700 bytes