Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbfce80263480e7…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 09:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7dc7acb6ddf6c78329b66935e7972205 SHA-1: 87200379b315475d949dd4c125efaeb841380f8d SHA-256: 7dbfce80263480e7f913cbe961fe0b49b680f1e76138c28748d587e2864b47bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various websites, many of which appear to be hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure and URL patterns suggest a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://katyababash.com/images/uploads/file/67004680583.pdf In PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/aae40913f262eb95bd727922d47cdcdb/bazudojumewanopatogafeka.pdfIn PDF document text
    • https://vendax.ro/files/file/tepusapu.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/fapodumolusafisajedafozu.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf98138116---54980970349.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821ae82d3fa---puwemijuvijatamejifibuxi.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/60785899196.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/23390794151.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/85927917074.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/46775527957.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uvablqcan5a8d4tv40s9q01bfg/26540388403.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/vukofadivukaketefisov.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/xowebosanusobezalobadiwum.pdfIn PDF document text
    • https://hssanesteban.cl/files/joluvisijedi.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b076d7319f8---kovasojek.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/86726544096.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/52415025957.pdfIn PDF document text
    • https://successalpha.team/upload/files/65240044941.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/75165332794.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/69597938874.pdfIn PDF document text
    • https://lbassicurazioni.it/file/kobubawo.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/d8526f7e36c14722143f5e1d26ce64f4/7203998467.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/54664801851.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/63be29cef7708e134b7d5fef1a147eeb/tusajajufebisorufuf.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2e84c4489c725a80a95ea9c90651a1f0/zivilorosexotasiles.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dr+trust+glucometer+user+manualPDF 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_off0000e811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 17888 bytes
SHA-256: 8f163d7d29a52b62d4f3b47ed3e05915644b3372401a13a155d24e1005005612
font_01_sfnt_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 10580 bytes
SHA-256: 70459a9c9c74dadcac68723d2b67d15adbad5dc7fc1dac906e6baeb65b0be5aa
font_02_sfnt_off00012eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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