Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09916a953d4f142…

MALICIOUS

PDF

73.3 KB Created: 2021-07-04 05:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1931d2d90d0b451ce99d6354c9aa85a3 SHA-1: 58638047aac5426a08a76591dcc9bb8763d6f6a1 SHA-256: f09916a953d4f14213be36bfaefe40f064ed01952feeed745e68aaa1c387f5f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or lead users to phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3293b0c38---79484363284.pdf
    • http://aldo-ins.com/userfiles/file/98193817680.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/5b9b5df9577c0622753cc97b425e2aff/kepun.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dafc7b6c27b---70250074314.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9c716e0922a579bfec21ed71e738e321/10123515531.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ahc18ei3sah2qdifoc0va6j0pc/lubebetib.pdf
    • https://syteq-pro.com/userfiles/file/joramar.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ac878541---daxufagatisubexuma.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/83265416332.pdf
    • http://interwork.sk/userfiles/file/30499011483.pdf
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/4949666886.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ea9f26cf---sinanagiki.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/g1fpavq66un2i98heeamcndi93/kumonixapu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfdd66d95f---rilogowezutulorowerod.pdf
    • http://greenbrier101.com/userimages/vutoxokog.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/70bbf8f9526fffe8ea72f436ce7393a2/33902071636.pdf
    • http://andlupa.com/userfiles/file/52729549423.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/uusk0gq82sit3m1fc614q30kr7/73437059044.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b164bmld9u0pc5hu5qpehcvj1c/10721301842.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2f04c6e4c---4805290052.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad382a9f2b---nikabofapit.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8faef8d50a---pivazezoguvudonagulen.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/6jh6u6q755sacl9hrqcbit4555/44190354606.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=simple+present+tense+exercises+worksheets
    • 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_off0000beb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB5 16792 bytes
font_01_sfnt_off0000d6c7.bin
a8204f1b94a30471909f65dfee0c397d5e4ef4673d6d8f1fae9de4bc383510fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 15764 bytes
font_02_sfnt_off0000ff34.bin
e1f5691f6fd9cef151e4d24f0e6ce74e221b28d5b23ba0b30485a40046c7f477
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 10832 bytes