Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad94019935ee642a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 05:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 05148219e2e269bec0a068f02dba02ec SHA-1: af1577b538114a94b5a147f7e5612a3fd92f98bd SHA-256: ad94019935ee642a78aea0b1b4f7550a3a44dd23e8bff99eb47388a9234b9f1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://queure.ru/uplcv?utm_term=the+pearl+victorian+novel+pdf PDF link annotation
    • http://bbdecontra.com/userfiles/files/xavide.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/nojupogog.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/guxokadovobimew.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/jupam.pdfIn PDF document text
    • http://abworder.com/uploads/files/43113671811.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/putidosukup.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/73d51a383f8b3f61d020bdf8a51a6298/baguzafabujezixokuj.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/90914685219.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/nokoralukunide.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/nukivosaberesodedisa.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/bitavugudiz.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/9318699061.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/losogigem.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e584438a9---16214604500.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/22931325510.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144f5670358c---pasepokasogokuwe.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/48293773397.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8eddfd71ae530400b65941cf807139fc/57474993381.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/38558580025.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/kekoj.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/fagofud.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/21338079842.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/87999152084.pdfIn PDF document text
    • http://asja.ua/userfiles/file/muvomip.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/17693510448.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/gilifemevalidamob.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_off0000d310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD310 10576 bytes
SHA-256: 93a8901e4125b6e25f5bfa81315c3d6883eb654668ce15a94151d7854269eec6
font_01_sfnt_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 18636 bytes
SHA-256: 02bebbee0279f21d46d8554be3c0813be0dd61573cd35ca41a7909d5421e76b0
font_02_sfnt_off00011b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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