Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78660238cfaf3f6…

MALICIOUS

PDF

93.3 KB Created: 2021-07-13 21:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0c339128770f25cd67f163bd2c82bb20 SHA-1: c138534ed7c42026b6aad18e2b9cae62004d2c45 SHA-256: d78660238cfaf3f6e016dc3cb9c9631915dede6f7020065fabd524559248307b
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of link farms on disposable hosting further supports a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=might+and+magic+heroes+vi+shades+of+darkness PDF link annotation
    • https://novahealthclinic.ca/userfiles/file/87588688093.pdfIn PDF document text
    • https://medtek.vn/storage/file/velojugotixudodorisiwe.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/goxanutas.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e455ad442---24052407925.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/sarukonapigupe.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c1b6bf5460433869c8c4b33d06b4503a/gotilapo.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/3p0grmkdetggqgjrsl9hj4ie46/nujunazonuwapapu.pdfIn PDF document text
    • http://dogable.de/userfiles/file/beres.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/h36v31vpd2rjq91s75gqc1fvqj/62659388549.pdfIn PDF document text
    • http://emeat.ru/var/files/83584815119.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/os5ivkep8hmqkjvbj7l28unp9v/37008994668.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/mosumadufigelal.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160765a49c487c---87848991131.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d4688d35---bapewimubupuwuv.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2686463b5---tudewuparetovegezazavox.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd36cc5da---61559712521.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e7e34d122dfc3f3bc86ffa6f963dd864/duzepu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/m238n5t440bsp11kelghqlr7l2/jinukajuwuxarugobegadov.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2b45032bb1159826b1ddbf82e05dde8f/54673696766.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/wivukifemifeduwafok.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f4960cafd61595b6671c22516e67e767/17011527245.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/de326bc4e7693d064bdc6561445e3a86/rufanak.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/9c7eb9fcc631f11860e8f6ed58f1ee10/sifonegugolufedesakiga.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ca99152d9bdfec171b6700f4a77b5c6b/kiwal.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_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A8 23816 bytes
SHA-256: f6723c02b5e19a92684435334df0ea0d06b9412b7ce3f2e9d2926d2eb274860a
font_02_sfnt_off00014c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C82 11028 bytes
SHA-256: 644355a5d683b812e2837d7c99e2e94a0b0f16a9c685edc86e6c887e251227d2