Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51a03623779604f…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 11:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43b8238bee528fe3ac764738857e4761 SHA-1: 8f348c32b850747a0cddd6ae859a3e9c2563536f SHA-256: d51a03623779604fd7663fad199fa3c13c984cc1e58ca46ab0cdcdf6b10a1852
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drafthe.ru/uplcv?utm_term=cool+words+starting+with+a PDF link annotation
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa71c12f4c---xewunavuzolefupogub.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af242ec03e---62117013946.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/fuxivevubepepurisesax.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210923011005.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210920184215.pdfIn PDF document text
    • https://xlquality.com/userfiles/file/pitojerivabew.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/90947731413.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/5392507434.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/49efd7abe1761b24184f3840c8c9563e/sakowupodap.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d14f1ca26c---xasobavarusujunexazu.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/91061132836.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/1218339681.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/94813630444.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/94923755409.pdfIn PDF document text
    • https://tsolisp.com/files/file/budugok.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/44233200960.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16321423389543.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/jarisidaronimazugoxizo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7259ca2326205c4fa2da58fd1faf9980/7979331507.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/73942856780.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b54f3937f---gotavogosulifoki.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/boputawisitob.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/35778753596.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_off0000b3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C5 10512 bytes
SHA-256: 10b57d9b5c1a9850f427d99959a8fdacc827bba5ac9e3ee22a97ebd5fc6e5e47
font_01_sfnt_off0000cb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 16368 bytes
SHA-256: 37b225d8c4e964de7007971353a22cdfc354a77b85b89adcaae387a253c1db19

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