Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db4b33683fdf8bf…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 18:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0e5cf77d12e06ae482b7307ef36628f SHA-1: 16867fbbf5b9203d53ef8b4d7000afe3832550b5 SHA-256: 2db4b33683fdf8bf3af3968e8065536b9382497e525f743aca98030317784d49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=types+of+network+security PDF link annotation
    • http://msnladyboy.com/ckfinder/userfiles/files/puzojawovenisupemujuz.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/t4hvqcq4eebo52ogfpnn2k1kuv/92020847209.pdfIn PDF document text
    • https://xistenze.com/files/files/rifokanedijututipobawizix.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/88631411890.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096caaaf3223---28228158280.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/8834134865.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/xozafamuzupavupoxurad.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/16742166246.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/kulawojuburatetipegabi.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/burudalekobun.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/7965019432.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/gomedaw.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/35058206720.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/adc82c73499f75a0c70964a39ea71466/74359993882.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/suwawo.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/97464171564.pdfIn PDF document text
    • http://safarang.com/basefile/files/48492423508.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/p8avkmrtreu467thuamfefvf7t/79478091336.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/lirigesumitafejidevoto.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/kojajudoz.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16113424d0373d---xujojegawaveroruwitix.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/bdad3e72d280dda65fa49757209033ee/78594687408.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a710409c0c3---romizozonibafi.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/tujagibi.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/33067317359.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_off0000eab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 18180 bytes
SHA-256: 2692da673925d93fa3c0840e22dc5e46177c7bb58ecbbb053cdfbd67f84297da
font_02_sfnt_off00013208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13208 10620 bytes
SHA-256: 759a735175b343ef0025130a37a2732257c556170b4de432cb79c407813e4092