Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22bf77a5c4fd9cd…

MALICIOUS

PDF

78.2 KB Created: 2021-09-03 02:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ecafc02b364015721103d60d9c7b8ec7 SHA-1: 19f831dae64f421cbaa0ad8bb764769c7a02a979 SHA-256: b22bf77a5c4fd9cd04b8acfec6c25ae0d260164577ce6fac79dbefef44416fc4
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely to distribute further malware or conduct phishing attacks. The presence of external URI heuristics and the 'SEO_DISPOSABLE_LINK_FARM' firing strongly suggest this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://feldbach-tourismus.at/files/fiwetupediwudutawe.pdf In PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b84c4e4b2ab---91026621202.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad398621d---rejibopaduwupiviluj.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/kavemagutope.pdfIn PDF document text
    • https://guijek.com/userfiles/file/tovuxukidekafenogubajik.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/008d2104e3f1e7be9d89b3228d458b70/47308225640.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1939d2982a173fd21f6c40d49074d6e/gapunereren.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/03fe9a100c2e500ae7ac759976a4d6df/xotizezeni.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/2d5c92709d5a7309d3223556340eb57a/75187553638.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/13253169977.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/sco3066rg819d44da807u1uli3/40875476904.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/65605006322.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8c5f38532076bceb69ffa3a1e92a07c2/40831873225.pdfIn PDF document text
    • https://alpinashop.bg/files/48219436199.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/43433869232.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/tifaga.pdfIn PDF document text
    • http://faxik.online/ckfinder/userfiles/files/rerukuren.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a789673a71a---23764727815.pdfIn macro / runtime command snippet
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160760eacd833f---9900733135.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/regipeleniviru.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/dd2bbc4414efb7aa70fbea23b2f81a2d/16534610999.pdfIn PDF document text
    • http://faxik.online/ckfinderIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=manuscript+paper+pdf+largePDF 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_off0000cc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4C 10768 bytes
SHA-256: 4f1a4c9bcfa88ce9690ab21c68cf2a70ea2f9cd1771cf67ccae118b06cb24b74
font_01_sfnt_off0000e500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD12 18252 bytes
SHA-256: 1212a471d30069a200c5e91f911f2f749ed5a9a03ebe45345be09409fa371c14

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