Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb91763de62de89…

MALICIOUS

PDF

96.3 KB Created: 2021-08-09 22:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dbb64b2e322e294a7e203f3d702814a SHA-1: d6d6fdae4c7392ad94cc18e0301c352bb22bdb12 SHA-256: ccb91763de62de89c87a3908c4a9f541f27c4289a125b696f8dc3c2772991a4b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://archism.ru/uplcv?utm_term=bcg+matrix+of+pepsico+slideshare
    • http://rajskiewakacje.pl/userfiles/file/39791798346.pdf
    • http://getem.pl/files/file/27148343351.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611028cda2c18---jikapoxazagoka.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3b74a2c78c636f3d65a4bdf7cf08f4fa/safudugi.pdf
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/34229775393.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef92c09345---duberonitodikumoruna.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/4lk3vkp7er9emlrflkk86vip35/wasunibifuzuzekowu.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/7b170ruj6oj8bnnabdjg061qis/4749983408.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/gozanitadefowowazebolid.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2cbbc32d11de580fb39b9fab79b6fb43/bozomumo.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/5f379183204ebdf21f47b46874637389/somiwonikaj.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca0b6e9025---56202129036.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/jji1ovl1l6sq2a732i6qrhohsu/tizetiditexukepedi.pdf
    • http://landroverbh.com/ckfinder/userfiles/files/69396918334.pdf
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/78340342649.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c8628045c---76776781954.pdf
    • http://biomax.shop/filespath/files/20210803130158.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f00bda763b2ca0a3c8cef70bab9c5899/60043615109.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/8214f0fbb0651befa829eb55d02a4ec4/xudakuzewarelewi.pdf
    • https://astek-telem.fr/userfiles/file/mutelokovezemus.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qgei062nu98q3ihv1iijd144t2/41305210696.pdf
    • http://metalltechnik-kutschi.at/97625507261.pdf
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/xewumupixiduvidizu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9cc.bin
3121f679b6d46e0096bcc0314d23a5da2ddc73f81732fe2f18afd6213e3c777c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 11116 bytes
font_01_sfnt_off000113a0.bin
6217df0f61fa8922ed26bd146d1cb6fdc0108db125d3405980d07a240b2914c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 18332 bytes
font_02_sfnt_off00014402.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14402 16792 bytes
font_03_sfnt_off00015c13.bin
5cfa37fce0989fcd98349beccf9a63719aff29e66b00f3ba655f54b68a91f5d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C13 16120 bytes

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