Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d55c183fb1ff98…

MALICIOUS

PDF

105.6 KB Created: 2021-09-07 14:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64272b702463b92f269973b40f0e25e2 SHA-1: fa0c19c93be3ebd01475f89131995159c6f27c0a SHA-256: 49d55c183fb1ff9891bdc2553149f148c522af07f09a47bddad5a3fc5ac5badc
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://medvor.ru/uplcv?utm_term=quiksilver+fragment+watch+manual PDF link annotation
    • https://nsck-cykelmotion.dk/userfiles/file/76873334255.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/bakat.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/71168457565.pdfIn PDF document text
    • http://school15-tyumen.ru/f/netomobiwurovirom.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df099baa3e3---80661628898.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/92573810071.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3049bb6947c559930fbddf638ec0c1fc/tiladejixedosololuposutip.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/ganiw.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/8913586271.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/bafojojubanisesijeno.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/19ba40a048bb8efd8df9d10e30d6c085/weriviwolora.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e257ca1e856---terexufodikilul.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/newojafisu.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/vizorepevujetagedowul.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fce155d851b---lizavegawemutomirevux.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/55643839102.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/31260010756.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac6281dbae1---45418660622.pdfIn PDF document text
    • https://adikkedua.com/contents//files/96077510102.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/24f2ce24e464467bd9830f61c1a70b41/zifepuxilepodemaxuxasod.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/zazevowiduxoga.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/zakanudi.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/95753938212.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/55481401210.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_off00013635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13635 19056 bytes
SHA-256: 260a17651833c8d6b50f6101bf97f4fc32c8bd79a0e7a89ad65c02cee6c362b0
font_01_sfnt_off00016707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F1E 11068 bytes
SHA-256: 9f3151387338632b39500ceead0f14bdc1f5a7b517af40134664bdd535a5cf18

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