Malicious PDF — malware analysis report

Static analysis result for SHA-256 830821a2b66c484d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-18 06:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c051c250c70e0e56c57ae620cf2b216 SHA-1: fc1397902f76fdf7806d0dd29bbbb08cbe045155 SHA-256: 830821a2b66c484def2a3e3171bcbe85cef2df2854bf47ffb33c5cc48e5dff5e
164 Risk Score

Malware Insights

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

The PDF file contains JavaScript actions and is identified as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of JavaScript and the link farm structure suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thenikharvconsultancy.com/userfiles/file/madufeka.pdf In PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/tekerazozixo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d9de68df30b45c1bd65d26780a224930/2466076343.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb636dbd1---6273680061.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/97353455975.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/93474687391.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/33521979061.pdfIn PDF document text
    • http://kco.su/userfiles/file/nedumidadebezok.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/kikigidudikatibejifono.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/51930926949.pdfIn PDF document text
    • https://forumsevens.com/images/file/nuguponudidib.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/50688409281.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/42153709692.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/31914857941.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/bowedinopebegevab.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/xazabesebozojuwawakujak.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/cf5961bf19bdd83dd1df6f68cb86d354/nevomixitoduginumivenu.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/zuvas.pdfIn PDF document text
    • http://saimiri.name/upload/file/mivunodewuxe.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/kedafiwekevu.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ace85a51267fc71cc69d71b565002e24/42718659867.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5b38550ffec74972139c2254bf8259e9/73043216522.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/79417043697.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd59392997---68063985902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=xiaomi+redmi+note+9s+geekbenchPDF 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_off0000b2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BC 11176 bytes
SHA-256: dfbb36cf2ec7bfffa29d4aa4627692faed71ade1387c4885901a9720436e5975
font_01_sfnt_off0000cc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7C 15468 bytes
SHA-256: 42c7e77e0a34bf5b039332b0994d459c1a3bb9d0464c25fa266145ed8fed0bc1
font_02_sfnt_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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