Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fe3de11ec913d5…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 16:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4525cd6e1b6a620d2d80097b8e3351fb SHA-1: 4dccfdb3bf6734c5967b88a6d2f9392d812b4de7 SHA-256: f9fe3de11ec913d5532efef0de2b5227608631455fe82aa88417cdb05587071a
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on disposable domains, with one URL specifically mentioning 'plants vs zombies garden warfare 2 apk android', suggesting a lure for software downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm structure are indicative of a phishing or potentially unwanted software distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=plants+vs+zombies+garden+warfare+2+apk+android PDF link annotation
    • https://shirbandifelt.com/userfiles/file/nibilosetusazetozuda.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/mebokulexuvikuxadipi.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/dedejosob.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f440dc602b---9275326092.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161482874b424d---jopawesoxejujiminawugur.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/fimijim.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/ligiwami.pdfIn PDF document text
    • http://premo.at/userfiles/file/27885790707.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///66924013860.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/xuxasejudefag.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/revegosakalukiremoneli.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/87714658773.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16140072603f62---90948898213.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/kusolamigogif.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/62838417482.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/falagomorusijufogobutajas.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/wipopabunanoleti.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/57496370124.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/59288341190.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/gupusagetugojurixo.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/defosiravoli.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/xezawerakedoxulogeret.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/hi94mjhlpiib8mj11fmuh2mqv7/pujedijubogogax.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/1984956176613aba4d3e623.pdfIn PDF document text
    • 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_off0000b166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB166 15916 bytes
SHA-256: 88e0b69db33910e5568a8cf9f4de2d001ae67744055f5c8e0f3285f60779670a
font_01_sfnt_off0000d961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 11404 bytes
SHA-256: c24f2bea9356993b6e8bf19c1060dd985fdcc78053e162e6e9737d0f20b6ee97

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