Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c5f218144998df…

MALICIOUS

PDF

61.6 KB Created: 2021-05-06 17:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c85b68a0438761f9f2c5edde146cf9af SHA-1: 51d570b31b6e4f8f365d6a7d545caf9ab76c5bc3 SHA-256: 98c5f218144998dfbbadeb1794ba2f913680f096733feb5435c2931bd40f3851
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards the document acting as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

Heuristics 5

  • 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
  • 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.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/qepkrf9ti7pcb4fhttooc2hq9c/56707050363.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/f703k0epc9v5kmuscs8s16iii3/namerum.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883fddb4162---sigutuzefelijagojeserevig.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/op16ev65qalt62neegtmcbir51/kapajakifedoxixasebewate.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/cde8a35d1a3638c29182eabb1760ccd3/66859017588.pdf
    • http://quickvideo.nl/userfiles/file/bifemenamukipagitidi.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/op7amndm5uiaatf4tqh68riht0/3912582171.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/20723a1a084b2f7ba743c087393d0ecb/84751540021.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6aba4135cf9619f768ac6de132016347/vitasureragemazex.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-3/20210503204620600142.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/kdjusi11knemangn1au977rg85/roxil.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087546ced68b---vidudowojewiwevotubu.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/c069e175db9eb00ce3dcf994ddbc5600/sijepuvekusuxez.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac080598b4---84354726603.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/758bf48a163cf6765064feaffe60fe34/bajewujiwefewufu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pay+arrear+calculation+sheet+rajasthan
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da54.bin
5e0f23320c68c24effe21d15dcd66d836f15456d9c50c6636529577af5ad1abd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA54 5068 bytes

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