Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d09815d3af89ae5…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 00:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d49118f05364cf1cab2d4dd99c86030c SHA-1: 14c6b873864639310507573f01a8757083703171 SHA-256: 5d09815d3af89ae5e4cc28a96de65423fc748d991de5ca1c4c7f5b29a0eb68a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://queure.ru/uplcv?utm_term=gta+cheat+codes+for+phone PDF link annotation
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/gezotebubizovojawo.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/tobejezukeposudeb.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130566771a6a---77421149288.pdfIn PDF document text
    • http://trubaopt.ru/content/file/70237686945.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/62270116441.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/90373606067.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/tuxofajivaluzibuperatata.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021091515583073499.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb6747ada9---sixutigufufolaw.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/xegajupazir.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210904130911_1hg3gd.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/nupokifabavomigusegirir.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/82075988061.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137058aac99f---88495718040.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/22127498918.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-20/20210920051501517931.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/29978048931.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/ridipatosotem.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/dde20cbf05a38c1976c0e6a05ac72050/79802324146.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/41234805780.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/ravutezaro.pdfIn PDF document text
    • http://steinemann-ag.ru/58372270971.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/22662365084.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/11879346668.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/vibotarenapar.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/bugumevipipi.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_off0000d9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 17872 bytes
SHA-256: f3c5c1846db1bc0aec9149c119afe840cb83701b350362d7c2020508afc82c0e
font_02_sfnt_off00012060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12060 10616 bytes
SHA-256: 02da3040d8d5b24bec3e3e98c370e6df8cd28edfe6a27a816c9f3d421ce9e3ad

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