Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6cab1f0a8d2882…

MALICIOUS

PDF

86.5 KB Created: 2021-07-23 09:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c2d6be8ad6cea77351e0ba2802f2f54 SHA-1: e20e5a7b2042cbd404c817a9574f4e9080aa7a51 SHA-256: 5c6cab1f0a8d2882dceea3a4b3eee020e013049b53834214263e835ecbc65bd9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or malware delivery mechanism. No scripts were extracted, but the heuristic firings strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://thaiwoodengames.com/files/upload/files/selobipoxutegazoviguzafid.pdf In PDF document text
    • https://ehlibeytalimleri.com/resimler/files/65184308920.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/94910244800.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/41823627741.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fc50a4ac4---bonodoz.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/kubapedejasimuxumegakare.pdfIn PDF document text
    • http://jarosi.hu/files/file/20745851605.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/1kn979ldcud2sv620g4skvbko6/3556868535.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/57daae28f1046c28d51051a6694a002d/21338708607.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/4516e95be794f01a097a65ddc562250e/11903279236.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/67051969736.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160825682f32f2---kusutox.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/soleminim.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/qb1vpedn77c49d4b02so6rj2hq/nidejibidix.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3894ea9d5---14391527434.pdfIn PDF document text
    • https://33mobility.net/uploads/files/43138428310.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/jikewox.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/1q9djcfqbt0u6t40nfu8ljod37/rikinopopaf.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7d96907b9882d5c4d26fddfe61fdf5f/rujevetorolulitatatip.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/wenezeduwitesegewujiwapil.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/minigerazasu.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/57555768109.pdfIn PDF document text
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/42795036139.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/06ab63cddf5b3c34b5c4c3ba68d15b90/86890596801.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/92906243000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=2+types+of+inflationPDF 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_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 16840 bytes
SHA-256: 53a6d3be3d136fb7325a0e59dddcb32f15966da2ef0a8d129b6d989f03db42c8
font_01_sfnt_off00011c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001341c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341C 10388 bytes
SHA-256: 7982efe0532a783e500ad44c6aaa60e8291beba6f22e752c31a91cfa039ed9b1

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