Malicious PDF — malware analysis report

Static analysis result for SHA-256 a013a9629cf44765…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 04:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b3a034033547d7d9d33c5391d122402 SHA-1: 63de3099409ac962c25608d6e541b0ad66a73732 SHA-256: a013a9629cf44765280bbbb8841cb6062a55025630e79bc9c882bf85ac0da244
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The `wkhtmltopdf` authoring application and the presence of embedded fonts are common in PDF-based lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inwebjor.ru/uplcv?utm_term=emulator+of+free+fire PDF link annotation
    • https://profipreklady.cz/www/ckfinder/userfiles/files/44498898518.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161336d7e6532c---56505408706.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/seguretilajafabedas.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/91368358833.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/28797998474.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/tapemovaj.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/savatelaxomuxexum.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161302f127063d---zibolibaduxovijutaviwu.pdfIn PDF document text
    • http://creationart.hu/files/file/64867815808.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/xozomofobizagoxus.pdfIn PDF document text
    • https://chineseclothingonline.com/File/goduzelopovijesaxinu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0905d28c51c8be9dee9f709ceebe2f13/98472263594.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/18698833068.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/fasagavebawokamiropexewu.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/leloxebu.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/fiwevixis.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/10662575122.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/8847451684.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/70196797774.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/pabuxebekazize.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/81007709387.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/vudukurakititusozi.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/kifevozetodemof.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/16630810209.pdfIn PDF document text
    • http://schokozentrale.de/idata/86990238817.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/taroz.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_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 10184 bytes
SHA-256: 697bb9b478347255fcc92e7cb9d1b69729ff9fe755bb0eb2e0c6197c8b391ee2
font_01_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 18432 bytes
SHA-256: 80d61014fd5ec610d7043f0f8d4bbffe0b9bbc9182365a069196334bb6cda8b8
font_02_sfnt_off000127cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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