Malicious PDF — malware analysis report

Static analysis result for SHA-256 89215d56c74eb4af…

MALICIOUS

PDF

77.6 KB Created: 2021-09-23 10:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ab23890baeac61d0b5c36cbd5ba07d5 SHA-1: a56981e2539a6bf176d2e807a372ac2904649c19 SHA-256: 89215d56c74eb4afd10fe251e8a805c42a23c4a4a82a999c7dab9430f5523795
196 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The presence of 'wkhtmltopdf' in the metadata suggests it may have been generated programmatically for this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://f-kcc.jp/user_data/userfiles/files/getegi.pdf In PDF document text
    • http://fanghsin.com/uploads/files/202109201646504865.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/zirepogigokazafutugerak.pdfIn PDF document text
    • https://lapakunited.com/contents/files/96164322672.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/14029622858.pdfIn macro / runtime command snippet
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161354145cc717---nulisafelure.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/maxitavupav.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/jonakisorom.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/27835357280.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/23178924037.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/76041325519.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77088390884.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5125a943---subolupixareg.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/rozedutema.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d485a0fac---fiwezuw.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/zuperojonuzedajofitabuxuw.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/pugozimiki.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/1733507060.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/sosakoxemujo.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/sovole.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/111ae68cda1746649cd991916929831c/gefikotivigudit.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/waxizasixiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+basketball+games+for+androidPDF 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_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 10984 bytes
SHA-256: 419a765dfe25a3a69437eeda83fcdc06db75699dedb85710423568de89951c76
font_01_sfnt_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 17208 bytes
SHA-256: 36ded793100a1cd35acaf2632f572efc12f7c50d0a6bcff69f1b73b146b0e763
font_02_sfnt_off000110c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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