Malicious PDF — malware analysis report

Static analysis result for SHA-256 9753b0bd258aa3ca…

MALICIOUS

PDF

94.5 KB Created: 2021-08-24 05:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e06ea96d1cdd85bb7f4f113ce4596eb3 SHA-1: 0ea399b3c15883de09bcf84b55f7b3e7c93c220d SHA-256: 9753b0bd258aa3ca3a7ab20bb6033ddc65e39735e2a93eb62d44710ed623ee9a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. The embedded URLs are likely intended to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 http://learnersdigest.org/userfiles/file/dosedapomopoliwibow.pdf In PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2c03f3785ce222326985193d64369a5d/32820171928.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085eee8d980b---93950547117.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/kibazurekire.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/70989386259.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075eeb698a32---31435758322.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/97453256039.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d08f033c68d30e78ef92c8c2a906efa2/mukejelab.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/paximobimeto.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/jozurifagibuzeg.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/f20a80023ffebdaa41d21e7c19acaf25/50498307491.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/9814737643.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/federof.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16091e4edc441b---liletigusabipikuwuju.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/sujatizamusadoje.pdfIn PDF document text
    • http://yulintimber.cn/d/files/pujiwakomipe.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/nepamirop.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/97734319638.pdfIn PDF document text
    • http://www.radiooro.com.mx/media/images/uploads/files/41410948786.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f765f6e1b8---jikepubepelexejexuzifin.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9461ea70097a5f19b0e1ec38146dd771/legesekozupidelewudi.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/j934ssbi8acjjl59j8l7bfjdt0/97120700029.pdfIn PDF document text
    • https://tavio.ru/files/file/vefazubikije.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/74239663579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=appellant+meaning+in+englishPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010b63.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10B63 27156 bytes
SHA-256: e620f5e19e87532b90a694c90583be51ef882dac7572ec251bb6e3ca3d896b22
font_00_sfnt_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 10460 bytes
SHA-256: 0be578ec631d14cf97f43d81d1efeb4eca7c988d19e3812aea2d5ab4fe44c8e6
font_03_sfnt_off00013c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6A 18024 bytes
SHA-256: 52fee95d186501cb036d7c48edbf4e65f3563e8abb3b425510cc6768c9f363e6

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