Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfd93194ecf7fc5…

MALICIOUS

PDF

84.5 KB Created: 2021-06-26 05:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0251090d8bc597a27f96eca0c8fe8bc1 SHA-1: 28f0dee558497a032654fd61275db87ce0fbfa1a SHA-256: 9cfd93194ecf7fc51deecbdf3e410ecc15b7ab5e4023aed099969ecaf202621e
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb7049a8c3---15124596435.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2c0581d62---52896010008.pdf
    • https://vigiweb.cl/dinamicos/files/file/mozutunugozowotogasuwuko.pdf
    • http://ascensionchina.com/userfiles/file/desiwaponabupivegadawelim.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c45153ce---60177926833.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/cc7a9c67160a0520246ff7c2edca01e5/25140694644.pdf
    • http://lavalnerina.it/userfiles/file/37327871915.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/fb17dc6978af5832d21ba02d25d2f8fd/86931515013.pdf
    • http://kuhomania.ru/ckfinder/userfiles/files/64816722229.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8876f1e057f79ade597b27d9bdf08300/gojup.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/43fa0de870ed478ade933f315e0e81b1/54964536553.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/068je37mda8b85hq5vqmpqf1nk/7764408018.pdf
    • https://minhkygroup.com/luutru/files/48459111561.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4dd9cff76b444e203c6afdad724c1465/22640673025.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6388d042097940e55d0f0891e2459117/34915842033.pdf
    • https://sonarmusic.hu/up_image/file/mekovibil.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd7c8146b---51049007325.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57e54c705---62962366653.pdf
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/67563801941.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/81sk552s84l9m9it8pud1l11o2/bisukoniragusepit.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160736eaf37d0b---31647251400.pdf
    • https://activepymes.com/pub/file/37665205422.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/db9ccd0d7db28b563b88efc74e7c5842/motopuxo.pdf
    • http://feriaalainversa.com/uploaded/files/korituburet.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16076206f8fb6a---84968613984.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b2e6e908b---37938209819.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=library+files+in+c%2B%2B+language
    • 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_off0000e494.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 16792 bytes
font_01_sfnt_off0000fca6.bin
b04acbb03d259f6776fdf0ac337977cc08bb677235be259368151c55db51d18c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA6 17360 bytes
font_02_sfnt_off00012a88.bin
6280c0d2d7a664dae3d8f4ccf680c3de9603b8fe3f8da52820044a01c0b10ee8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A88 10604 bytes