Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ece5803da34669c…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 00:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33e9d7fad32e462fe0518671e9ad9c90 SHA-1: 2bac842f4bf4e265606a9e070c1d56e2e2bbc320 SHA-256: 8ece5803da34669c0f114080996dbe8477fb0608748dc51a26ea99ffbbba52b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, acting as a link farm. Heuristics indicate it's designed to lure users with download prompts, and ClamAV detection confirms its malicious nature, classifying it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=sarileru+neekevvaru+tamil+dubbed+movie+download PDF link annotation
    • https://fo-prefectures.com/pages/files/sizofewevobaxis.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/vozitexepewofetejezo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136432903d3e---gemubozusovo.pdfIn PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/32098911745.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/timesu.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/91231735834.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/fokemokigekite.pdfIn PDF document text
    • http://koddous.com/userfiles/file/vutoz.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/fokifazobiwanowan.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/72461927117.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/joragufexevirabu.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/xejuk.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/gotivosomusawo.pdfIn PDF document text
    • http://centronegozi.com/public/9571597725.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/fojosivulifulugazisopimuw.pdfIn PDF document text
    • http://centrons.com/uploaded/file/361513470613ec1271d447.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/xawororemilene.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/supem.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/rulododupitosejobukimifaf.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/76624873776.pdfIn PDF document text
    • http://clingac.com/d/files/lafov.pdfIn PDF document text
    • http://stagticket.com/fck_upload/file/zepob.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138feb2b7356---pavovegomejigaragaduvun.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/17648888710.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135164da5e88---12980721054.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_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 10800 bytes
SHA-256: eef65fd377c46fc43d8813d2e8f3a5cb398194706db9d3b53709a5aa147c2135
font_02_sfnt_off0001140e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140E 17692 bytes
SHA-256: f75a27754d2778ff173c2f91ef7694d808f6d7c98c92eb0ae57fb65dbd88d030

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