Malicious PDF — malware analysis report

Static analysis result for SHA-256 6faf1ac5be0e5970…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 15:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 919f63ff9b3dca06a066e1f39d658463 SHA-1: c2807cdc6579935c96cfdb682ab63674c97820e5 SHA-256: 6faf1ac5be0e597091590c9d14ad18afd659ed37b8481a6fffd0058371ae52e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating a malicious intent to redirect users. The heuristic firings for 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a link farm designed to host malicious content or phish users. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e63c3a83f0---87125353226.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7tvsvotffjh97uqorgad76jl54/57324643045.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/16711656837.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/dedixixavajubaj.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9ac1d031---jedezozaput.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613083558e108---70922057805.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/teforokowujuwise.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/mateganazas.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/93282460774.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/78283194811.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/zorutufadem.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133b9f6defc3---82143603468.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/5586697487.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/75891461343.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/river.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/neganol.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/bamewexajegur.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/88478560348.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/62895864926.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/59395874773.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/fasamijurenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=frozen+2+tamilyogiPDF 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_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 10556 bytes
SHA-256: 73a10a6b666dc78b87ebdd9aee7ed0fa5e709dcc43f006b2f769f6f902eff95b
font_01_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 17628 bytes
SHA-256: 5c564d5dd37383b6312ac3732b34ad4793cf1035570572f1b49b8a3221b5e829

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