Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e35ded7ae381a03…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 12:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4d85d445ec7c672375cf45e9e3fb08da SHA-1: 452648eb1db0a68d5b88ee9c64d25ea4e8f82860 SHA-256: 2e35ded7ae381a03124e6d170d8f2c5e03c526befdfcd2d26bbc9802998e1d48
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The embedded URLs and link farm structure suggest the primary goal is to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=learning+grammar+with+fun PDF link annotation
    • http://workontext.ru/media/file/ributiko.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/notovogo.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/vageniletubajev.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/mulinine.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/76871388133.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/44601034824.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3p9iqae2m83ck76s5arl2u9gks/8344799579.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/98375253961.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/rafovokenajatosodiv.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/73888473950.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613915643544a---fonadek.pdfIn PDF document text
    • http://www.pvvc.cz/files/fegamojorakudowemakobemoj.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021091121152973499.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/kofoda.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/642192661.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132381a4b8f8---44906225001.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/busaguxusenag.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/luzogijaw.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/3gqpe3ahauedfjd7vrcv5f6sbc/41403855378.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614114889d1dc---87121235351.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/45704691178.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/jovolotupuwenukatulemivo.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/36487382380.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_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 10468 bytes
SHA-256: 8b0b5dfb17796f5d697cc30a93fe579162152422585f675f398cd6c80ab46501
font_02_sfnt_off00011046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11046 19456 bytes
SHA-256: a7f306ecb52c86fd2d39a470f81a83b20bb17d4f6de28b1a040da6e525b6d6ee