Malicious PDF — malware analysis report

Static analysis result for SHA-256 58faaa9b06d474d2…

MALICIOUS

PDF

78.1 KB Created: 2021-09-11 08:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27bc8af0ab6ae1ecf22d995f7a99e521 SHA-1: 26d6aa24ebb20b4c56ddcdf15ff3fc2869ec7e48 SHA-256: 58faaa9b06d474d2f371ce11798cb7e2265fbd850ca3d9bc67606fced6ede3eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing unwanted content. The presence of a link farm and the lure of downloading a game points towards a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://duonglaohanoi.com/userfiles/file/54741026825.pdf In PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/89642333442.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/15171417293.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/lozaposokitovufada.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd6d552336---rupikesanimulamatibadexu.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/fipazovakonigamejirub.pdfIn PDF document text
    • http://coumert.com/images/file/loparedajenewaxer.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/nosakapev.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/36419055314.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/71134782800.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vd095lflf5334ja1hcuu382nj2/tiluxivarikufibatufafiwo.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/fexulatifefajamigawesejav.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/192630739.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/pexukijidibegolexineluk.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/99684435547.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/likefadonenovulafexenami.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/gapifemeviwugevusatekewo.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/bojopekulolivesuxi.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/90162663051.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332942004b0---51026663995.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/vezosesuwigesixi.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/tunelesagofixajuveb.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/wikelalovafinejarumuteke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=real+gta+v+android+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4B 10452 bytes
SHA-256: c9f6a29669febf22fbc367de1aeff497b54e46d1d7c9d06358fc0803445bf7e6
font_01_sfnt_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 17124 bytes
SHA-256: 2cad6b0a7097f55dad5f4cb7559e6a9a5961aab61e63a7407d1e2023d8d5e587
font_02_sfnt_off00011349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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