Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5cb8c00807862f…

MALICIOUS

PDF

91.0 KB Created: 2021-09-04 09:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 778a6521a7d7f02122ae5ec9d442c09f SHA-1: f1d90db0d6787c78428f0f18d017835f051cb372 SHA-256: da5cb8c00807862fdb6fe6c8f6dc0879bcc619d7eaf0d45e1a8cf9c5961e790e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://oniceh.ru/uplcv?utm_term=transposon+mutagenesis+pdf PDF link annotation
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8bac460cf---rimamekadevelazimaforowa.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/91092376108.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/58444257179.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/74340384217.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/48040879612.pdfIn PDF document text
    • https://ikima.fr/uploads/file/sedax.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/84997650396.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092965ba63ba---69350937542.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/nugivesuzirabobegis.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/t3raf1gmddabn0knb24kfijl95/63363427193.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-08-19/images/files/96382215700.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/60179770192.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/q6jvj7juosp3qoqdop0sk8s501/fezokibasifajepuwalara.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/74ec0e9bcca81370526e9be23208fb0a/pitaxabuvuxokamujixup.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/73681556475.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076523dd04c8---vovoxolufudajegus.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161081ca755dd1---xuvilaripofu.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/57288605220.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/sojerodo.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/31427217521.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/39b0b9298206929b1846ea393ef6f38a/51832745257.pdfIn PDF document text
    • https://manenshop.com/upload/files/29002851497.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/nigoxafiratodawokiw.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/ludolaxikavep.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/gutinez.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/kfvd6vos7lcrfomrpamva5i4o4/kitivavovuveripuxugeweg.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_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001160d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160D 10856 bytes
SHA-256: a348f433e2c8a3dd6896f7f64dcfb88f01fb1cab173b600c402a225abc8fbe7a
font_02_sfnt_off00012ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE2 18112 bytes
SHA-256: 221f40d8aa5f3c39b44b8d145f4f0a36af16e3e7e6d4af9dc4301170866baa12

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