Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d76af5563eea77…

MALICIOUS

PDF

141.0 KB Created: 2021-06-17 06:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0023a45bbafcb8fa238f4ede0c395510 SHA-1: 5d08864f8ccc7336f33ce8e7118b94d133ebf386 SHA-256: 93d76af5563eea77748a9308295eeb1edc3527a031689abd06c86d46838ddcf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised websites, many of which are hosted on disposable domains and utilize form-builder plugins for file uploads. The document body, though heavily obfuscated, appears to be a lure related to a movie search query, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pistant.ru/uplcv?utm_term=dilwale+full+movie+shahrukh+khan+car
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e64b06740---91685740709.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/kr76lukdf4ei51vslmussldu9f/29680365639.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/307048df4d97141da16380e0b085395f/pitomiza.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b168241c9c8---59694376032.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b987eae361f---97819404327.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c5381c5d8---61428533236.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6132932059---71610559857.pdf
    • http://ktcz.eu/files/files/69456290161.pdf
    • https://ready4use.ru/uploads/files/lonapazevevowudorino.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/oebh1qivuq3fmsfn2pnll5r7g1/kogepari.pdf
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/watamigatoxuzukitike.pdf
    • http://ufnk.fr/app/webroot/files/file/10528571793.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/sihkdo66e81epc2qel3e29ics5/bufomezavev.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081abbbc37f3---zupoxib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ae62.bin
ca47deeca23d821871807165696165cd8453448d9fd96fc75a168895b5f648aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE62 8600 bytes
font_01_sfnt_off0001ca33.bin
25e80982630b9f0a16fa26c533695f0c318dc0009b2c8c87ee47536672ab803d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA33 5336 bytes
font_02_sfnt_off0001dc44.bin
9ac488501cf383c9bdea4e9ab2b538d4abf353152eaac64f25895925cc38087a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC44 1896 bytes
font_03_sfnt_off0001e55c.bin
df5496cd21e43ee8503571ed72ab73d274ae8e48a5b9d4e884e475b60e5a4cbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E55C 12704 bytes
font_04_sfnt_off00021054.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x21054 16164 bytes