Malicious PDF — malware analysis report

Static analysis result for SHA-256 81baed89f8e38c3d…

MALICIOUS

PDF

74.8 KB Created: 2021-08-03 12:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 61c6f4125e8d7d54196aae06a5727754 SHA-1: bd987947e46b587aa5ebc8218f02f3f2a2e9e7e1 SHA-256: 81baed89f8e38c3d24ab78068bc88f5706d6b512fbffee09c963fc28118d230e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to various domains, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. The document body is heavily obfuscated and unreadable, but the heuristic findings point to a malicious link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://shannonlakeestates.org/fck_images/file/gerelasitubebutobelosa.pdf In PDF document text
    • http://cppzone.ru/users//blogs/file/83856370202.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/24878025294.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/negupifege.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c5c62c700---59227857792.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e8a478c1b9fc79449d8ede196bceec88/sudatubenenonudezosadegil.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/48930336490.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/gezaneme.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/654662fe8f5a976becf67d8e6e1e1066/58756081115.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7cfb2d5bd842d1a3d860d5aa3aa360e2/gijelijilesiwapusemonak.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67a9b09a15---nepokunasinumalumazabe.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a028a231bfa---jibomelojevax.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd824821c2f---34464176402.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/2667d3e6336bf5d6391ad12ad7f93f91/88289891379.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e17ec81cddaf44b0db1faeca4c75823a/92519473705.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/11c72036f7c0626d102476d000b86048/govasulikadamedijar.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/r66jop8plj90jfg0hck3eme7s5/7199890353.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/84743466086.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a9b411c5---29640566455.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/37177306106.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210601024809.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/tovopeponugituk.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/vugaju.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/75799680463.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/cb24a83b49ab158c8a073f111923545c/bezakotoxazapatexosesola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=onbathu+kolum+ondrai+kana+tamil+mp3+songPDF 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_off0000c106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC106 11236 bytes
SHA-256: 39212f876008a669657ac0081118bd349b856173cdbbb6599aa2198eb43b88dc
font_01_sfnt_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 16332 bytes
SHA-256: 0a1bacf93816a62095465dd990dfa48481f95f388ff484a185f6af30c357de72

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