Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c0a6bc6bef4781…

MALICIOUS

PDF

84.0 KB Created: 2021-06-25 15:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0cd4d1d770ff5e2ce8d83fa552eabc0 SHA-1: 7fd8e98d48b0dd03686354258b96dc2a84164c2a SHA-256: d6c0a6bc6bef47816f4c0bf4001634e779335dd65d5e3e7bac1b49fecdcde4d4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier strongly indicates malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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=peanut+butter+and+breastfeeding
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/aad47c68f104967009a1e0629b100e41/37731414060.pdf
    • http://ifa-astrologie.de/userfiles/file/vexidemekiwawos.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce338daf568f912018529b262d0b6a32/nexubumorojade.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/2tdfn20g52h8dp01nueg5v4jbr/19201756833.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ddf3ef506824b4ec6a1fb7732928a211/90145382494.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dde40cda31---tegewesifowasa.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f22393cd05fa7ba10521521f985c77db/kakadagiseluve.pdf
    • https://ludifrance.fr/userfiles/file/90773807248.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cefe6486275---70798672310.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7212610eb---buniroz.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec696051f---munasaxuvakajitarug.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3de2db9dd---nutoziwajotixeralebila.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8762021e13cf957dce8dd9c80a1ba7e2/tunoneweded.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e6d4b4fbb63f20f025f7f879049e4161/leboronor.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_off0000e546.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE546 16792 bytes
font_01_sfnt_off0000fd58.bin
826c1b858db2949df2626e234815ea40c78eb4ea07a2dcf8d51b00706fceecba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 17448 bytes
font_02_sfnt_off00012b3d.bin
8e838ddab4db986bbc56a5a98f7eb922b34284ae87310e8f0ca31fae42a977b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3D 10604 bytes

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