Malicious PDF — malware analysis report

Static analysis result for SHA-256 97de5f35a3963be6…

MALICIOUS

PDF

84.7 KB Created: 2021-09-11 16:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c513c2acfcd681f81ec72de44b250d10 SHA-1: a0191db2b169e4444237ebf0753637531161f71b SHA-256: 97de5f35a3963be65a80c4a55ffff36eaeff7d2b72cdfd7367087899d3c9ba0b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or scamming attempt by directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://www.pibmg.com.br/ckfinder/userfiles/files/files/96836428374.pdf In PDF document text
    • https://alixdemassy.fr/userfiles/file/43135862817.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/vuvebitovafebaw.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341395d7d8e---7120441030.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/xonakezesebowusafezumisab.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/godewamuparu.pdfIn PDF document text
    • http://teakdeck.pl/files/file/99900422192.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f9ad5e7f---75207185240.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/2h1nicknmrad5de3t9pd21jeos/94177487297.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/rewedisojidozi.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/65635696762.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/letisazepuni.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/63089967032.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/veninufuxa.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/21977715484.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/32801916764.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135c966cb8c3---xakobunosejatojivabaki.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/82207025139.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1epmi9p78m4jcennl4787gspr5/fevubani.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/nitawelewe.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/23456440469.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/busidetozigan.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/3624178048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=battle+royale+3d+ioPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC803 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_01_sfnt_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 21732 bytes
SHA-256: e247fb528f52a8a9d057c66394e1f07d3d3116eeb84e12d35739d83cbd21074e
font_02_sfnt_off000115b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 10308 bytes
SHA-256: 558ed3765030022fbc4d0871a9d76418dee66d1c1df0ab45123d08492c09cddf
font_03_sfnt_off00012d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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