Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f092e5eb2ee6d95…

MALICIOUS

PDF

86.3 KB Created: 2021-06-26 03:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5c4e04146a10ab4ceb9e2c439188d52 SHA-1: dac4aaf4ddd4c0e0e9b0ea2a75bf9045537dfb24 SHA-256: 8f092e5eb2ee6d95554a4e1f3069a372988df0ed30742fd02e012749caed9305
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The primary IOC is the URL to a compromised WordPress upload directory, suggesting the document is used to distribute malicious files or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a3ca4ddc5---70574218018.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ade72aa2ffd---28445881514.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/18287adab05db03eab597d811ee9eca5/vazirakeji.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/13cdkdnkp8kdbamqmtd364g1c5/kijexejiw.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160845c783d286---28459768440.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/sq1h6b2ltpplppig10585l8m1a/jitaru.pdf
    • http://arniestribu.com/campannas/file/tusipixidonok.pdf
    • https://itexpertdog.com/upload/files/tatibunej.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2hl5thh8jtgi657f1mbqeqvg65/14915551209.pdf
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/48978283861.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab3eb8d36f---1798920808.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2aa5ea878793872494ba0b25140b47c3/sodib.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/511ee4b10190474a2328757ebdf9fe4c/24223295260.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b2f02b5e76eed901ee03c1dca8a38fa9/67226679795.pdf
    • http://dent-pro.cz/pic/file/zatulorodejoxu.pdf
    • http://ilturismoinitalia.it/userfiles/files/46150026230.pdf
    • https://lienlacanien.com/img_pages/file/91250932277.pdf
    • http://namuvaldymas.lt/userfiles/file/kotojubanekox.pdf
    • http://bet-balance.com/userfiles/file/46480942642.pdf
    • http://suttonoakfarms.com/clients/880813/File/moputazidamedobu.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/7cd75d8bd97c7a9114e8f6ad6e87514f/30336666921.pdf
    • https://llsindia.in/FCKeditor/file/vexitejizogeputamil.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/66046226564.pdf
    • http://lamachine.nl/userfiles/file/38743685131.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pertussis+treatment+in+infants
    • 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_off0000ee37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 16792 bytes
font_01_sfnt_off00010649.bin
4aabe6498b3bf6662e265c47ba6f35fe5695dcfe4b2900a065160cd967053324
pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 17636 bytes
font_02_sfnt_off000134c6.bin
029b86b49c6abd24a377c206bd103440114ef6d06c56dcee46811980d4148c18
pdf-font-stream PDF embedded font (sfnt) at offset 0x134C6 10308 bytes