Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8ce15d99d57d02…

MALICIOUS

PDF

89.9 KB Created: 2021-08-08 23:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 856e3ebda16985fce6efb663412ca82a SHA-1: f27f5f5bf91f89339f6382ca7dc06d7257c760be SHA-256: 9d8ce15d99d57d02e87220a9c118135cc136fc7630523bc69b3d9ec79248631d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations. The presence of a 'link farm' heuristic and the ML classifier's high confidence score indicate a malicious intent, likely to distribute phishing content or further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=old+school+bodybuilding+routine+pdf PDF link annotation
    • https://samtee.com/admin/images/file/waponebo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4acf5314d.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/moalmrnopmn0p6oigls2p3bukh/69557381040.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ed94dd7d42f434092b6d34f6bd389b07/rixugig.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abebbf7e194---luratejowemagivigu.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2b4f6c8a6---6759847536.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210804_006C35F9D4C17CFF.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ml8gs1a8ikj937a9i52kgc8417/54166184698.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/64254384765.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/69fr946ks1rv5tal0uj57ccth3/41319034189.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/65866531530.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727578a0432---xotupobexilujas.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/vopefalodulajanonaxeju.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb9f5cb631---82547384734.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/vifqm1agim6dvsf1ku4gqit2m1/58314647096.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/49529727010.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/53649024514.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/4lf1iblrq4coibmh5ithrjtfo8/sufafekiru.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/kapuwogolamonipelo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c882af7509c---siwositupazipuju.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/jogiwudobubu.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/1qeuuohdiigh49970jhhsp2td1/55139482710.pdfIn PDF document text
    • https://led7.ru/file/ribozonizix.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/dc9825717d9dbc931247b796c1d657c2/32130416066.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_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 11116 bytes
SHA-256: 41a5388f4cafc9c67becf4b0521cab7907b7de1819e40d042b05674b4565b357
font_02_sfnt_off00012cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 16936 bytes
SHA-256: 0ad3083c59adfe2dca53c8875950ba94cb6d5a1d489f72683b3f010f8ecb933c

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