Malicious PDF — malware analysis report

Static analysis result for SHA-256 914ba7dd7425ea0d…

MALICIOUS

PDF

89.5 KB Created: 2021-07-17 16:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4472d7a864ae37c9ec715a094af01521 SHA-1: 9fcf678b49a70b7d58b5828ac8e9439d000accdc SHA-256: 914ba7dd7425ea0da1c5b4fd5373f8862d37bf0a110414ad1870a1bd6a77b843
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608424b2d84f4---fidizatajurov.pdf In PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/sibibogakujixelorugitag.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4bbe549e5---22826134242.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/5tnvb0ppvrq8qf2fvsqtd8cjfg/jamakojepewidezev.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/36228977617.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/gobozukoralanesijitawi.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/8jv251nph5gddt2q75b53ii8q9/53238626595.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/riderimemevuwegezameboda.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/l8ketpf7f21c3r9ev5tc81aode/xorerogexamelotudadokef.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1df8dfd11---35264055157.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/zegedaxifizojujawituzoda.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/2asj6urbr7v8j02grjjastf2p3/38754965032.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db85edc529e---77761292554.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/80818231557.pdfIn PDF document text
    • https://ak-oroslavje.hr/files/nisuropevilalasoposite.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rajenevafiwotakat.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/wofivawusovubaxofumo.pdfIn PDF document text
    • https://faprosid.com/file/3100736178.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/95388184193.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/puwadibepamubazen.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/kupadagimefopajuwofiluze.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/fewodefitupuzi.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/xixolozugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=perineum+after+episiotomyPDF link annotation
    • 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_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 10688 bytes
SHA-256: cd984cdc9c5e07ddf6b21e2c2cdd8c0b8bf2016523dc3e79163afcbf2bc52ce6
font_02_sfnt_off0001289a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289A 18000 bytes
SHA-256: f652aa51e17e097b0ea6a600faea097b7df016d2d76e11bfacda0ec21c7fdbb7

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