Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0139294ca75c09…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 09:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ab47380a55892c6a5b6dd235f8f2b90 SHA-1: 79b7aab4b0ead1eba06445368e99f8d24c80e471 SHA-256: cc0139294ca75c091497aa339f6075646191a934b13b60d21e18251515ec9b3c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, directing users to various domains. Heuristics indicate these links are often hosted on disposable domains or compromised CMS uploads, suggesting an attempt to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=farm+simulator+mod+apk PDF link annotation
    • http://aucontecnologia.com/userfiles/files/6761172046.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/goziwokexofel.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/notafateranunudixuzo.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/65244412023.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/libejipuv.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/vumezugowerim.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/4848267327.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/91561764307.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/27000215278.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dudonosizeki.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/61645278603.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/bawam.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/35837095741.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fa55s37phek5ntfk04l3frrdhd/kaxavezu.pdfIn PDF document text
    • https://ekransamara.ru/files/fagoxenevazurowipizivazu.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/tadonivenusegavoneseba.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/32354940714.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/c3s1joog54ai40n4vvutvd908r/giraroromow.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ec91da2b8b057bf9a9e310adc172bcd7/nuxefegesoteguv.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/9108493659.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/mozawowusepegivalu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613765fd76613---vilexi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0b1e3eee7---sisuzigazaz.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/15224133203.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/44386671922.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_off0000d71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71A 10484 bytes
SHA-256: d638d928bc7ea85b06d494caf6dca50aa0d84f8757ee049c3ce89c1ff71b0c3f
font_01_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 18612 bytes
SHA-256: 6ab541d76b2f1937ec18e96e5671632a60428c171caae0bab916e77fd32671f2