Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e49b22140b9244…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 09:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ac9b82b6eefebda9093368bff33d86bb SHA-1: 44276beabc993c5d5f41e2885a94d39fdf671b1c SHA-256: 28e49b22140b92448a9c8c27774086883e96eefbcc83e8a1a2d4791f1f163ddf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external links, some hosted on compromised CMS uploads and others on disposable domains, suggests a link farm designed to redirect users to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic indicates a deceptive call-to-action, likely intended to trick users into downloading further malware. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=hunger+games+pdf+file+free+download PDF link annotation
    • http://haustechnik-hagenauer.at/28026161481.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/83634205087.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/32234031582.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/rozegimagejaxu.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/vovojolefelilobegakefo.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/69229287188.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/sofesiscjtbc6odrc53u645ndd/tunotixonomatuvetule.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/5odg2nfsolde2hni7ge4cjluc0/zafudarifereruj.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nie0bci66tdeoul37bfibd3dv3/kugaloluzame.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/gedinogatukidax.pdfIn PDF document text
    • http://dejede.com/userfiles/file/wojutukirawuxozalafazox.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/49373989715.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/fifununewaxeralakijaz.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/17272900817.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/87388733371.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/97398100855.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qgmga95k0ltmvaogqau1ebhih2/lupisapoxunukusa.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/perinenomotexap.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/kn95olf7b676ibhsc9cpupaf2s/77694647123.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/21612287774.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sugugibajagawadasinezixup.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc45a30f7d5---29724022552.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_off0000d6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 10920 bytes
SHA-256: c106b57a0ce0d16745a2f153a4609a806d1297c0f0c3c8243f79669a4a0dec46
font_02_sfnt_off00010802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10802 17844 bytes
SHA-256: cfb1d52ad9049c627dca315f1e79feb6be5ded2ce9de67b92e65859f90dfddd0

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