Malicious PDF — malware analysis report

Static analysis result for SHA-256 f179bd8a54b982ac…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 09:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 07ce9daf51e0f76661074d9b725240c8 SHA-1: 1aff3c860a53cdee98437f8520165767a6531153 SHA-256: f179bd8a54b982ac5e123670ea1cd9dc3d2b5e15c8a906a18081b684dc0f027a
176 Risk Score

Malware Insights

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

This PDF file is identified as a phishing trojan by ClamAV and ML classifiers. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nomylo.ru/uplcv?utm_term=michigan+commercial+drivers+license+manual PDF link annotation
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fad682c28f7---78659286794.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42d368e436---vorobemesi.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/rupixixuzowemonudif.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/kijesexifiwedomunaruti.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adfdc19f4f---takijugasozotif.pdfIn PDF document text
    • https://dm288.rs/slicice/file/58709847247.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/zavekonoja.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/2994236466.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/897d238a12504aaeae2008a45c61d33e/biwab.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210825_74F340190046F164.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5d15e5ad2---vakepilogagidezuromaz.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/83048202964.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/s9rciq2k1rn8lb2r19u3qqkate/78538625236.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760a2962572---87489644959.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/24f6d8e0ab0d0b17eec57bbe95e58b64/92927229750.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/724873328.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/dijeludujejofeli.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d6b2f145856b9379ee35d3b15c663de9/jovuxawipasutibof.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/0234488d0a6de77eeb288902e6d65c38/54894389741.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089f0c56c379---92342852544.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210815183525514.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/purerabaxibozadubotagulut.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_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 10880 bytes
SHA-256: 133563ad872ce6666d49a318fbb0fd05aac3a7c2f9d0a9da2037273e92ad03f3
font_01_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 17484 bytes
SHA-256: 7a1c9ac577b6397e8d03518cc9b0aaf04cbf8acd723ff9187e93a63a5d7c72b9
font_02_sfnt_off000127b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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