Malicious PDF — malware analysis report

Static analysis result for SHA-256 4849bcb766835d43…

MALICIOUS

PDF

90.3 KB Created: 2021-07-09 17:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bbcb6cc0f424f795f2c0789b3378b3a SHA-1: 460bafea006ea752289ea5ff7a54ab9ea74be0bc SHA-256: 4849bcb766835d43a2d0b784b2243a0ff62cbc88c9724ce72dae931f209adb33
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or serve as downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=a+family+submerged+2018+full+movie
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b058eaf3136---fafevewa.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3086f42c82---favafog.pdf
    • http://cuatudongbinhduong.net/uploads/files/ledalagidekasuzikutewob.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b24bdb09---24704083701.pdf
    • https://notrepanierbio.ch/userfiles/file/39156769371.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d588b438a---8554823353.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/abd4c07da619baeaf74208b2a610011e/gelabizonuxugenoluvakefi.pdf
    • http://riggi.ru/userfiles/file/96644354533.pdf
    • http://dagmare.de/userfiles/file/15596577988.pdf
    • https://readandenjoy.ae/userfiles/files/47433547508.pdf
    • http://araonline.hu/uploads/file/65360217934.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/elv5pdgivqt8d0s591tb40nfm5/24813831511.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/i4qqmvg6t32kg0l0qsp0auca88/nudubodimatufajugitu.pdf
    • http://cgl.lu/userfiles/files/48821414232.pdf
    • http://zovsh.com/Uploadfiles/files/jafulan.pdf
    • https://jahanchart.ir/data/files/file/nilodozuwemojek.pdf
    • http://linkipt.com/_UploadEditor/files/fedopexamifiwubi.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9265d9e6a---dovoxipavulokev.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/namesugexunuroropotupaxu.pdf
    • http://dambi.pl/userfiles/file/54577505736.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/pokezemuzibufeximolum.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/35a682acf4edb40f8c38638ffc6d7485/43906756096.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf8f6e859---juminatudoxepiliporewoli.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2ffa136bb---gokusupe.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d17611fc850bb78c85c938f573b4c85c/52088363721.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb39.bin
97dceea49689b425a99144f34a15055e9e0b49fedb97d1fbb85c28c089aacf26
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 16932 bytes
font_01_sfnt_off0001272f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1272F 16792 bytes
font_02_sfnt_off00013f46.bin
9e0a67fe71b989c41131cec7296efed3078ab39b1d6cee12f351ab6da3fe1816
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F46 11400 bytes