Malicious PDF — malware analysis report

Static analysis result for SHA-256 3527670acdd7fc0f…

MALICIOUS

PDF

86.3 KB Created: 2021-09-18 23:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 525e94fb0927c706eb5cf17daf329cf7 SHA-1: dc694ccd1ef88c8a42f464ba4ac3255ce1d5cb2f SHA-256: 3527670acdd7fc0f3ac4f2265aec7721017771a4b88432b65778647a06e6d21c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to potentially compromised websites and a heuristic firing indicates a 'clipboard command execution lure'. This suggests the document is designed to trick the user into executing commands, likely to download and run a secondary payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://wastran.ru/uplcv?utm_term=open+a+bin+file+on+android PDF link annotation
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/faguju.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/36380740112.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/vejomesukimovuda.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/roginoda.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/55538532274.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/zonuzefotitireso.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ebb507d3a37f9cd8c93d52b9e2760fb5/62891425541.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/wesigejefose.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/34616179191.pdfIn PDF document text
    • http://momsystem.ru/public/file/17840629639.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/86280163249.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/48141836072.pdfIn PDF document text
    • http://355353.ru/userfiles/file/94858039353.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/80779555129.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/46904825473.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/75721556014.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/nudesatepukikivakawer.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a4721a4caf4ae76ae0d923391f72477d/12442998756.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140d29059543---rewifuje.pdfIn PDF document text
    • http://rurisnet.org/images/file/20950750691.pdfIn PDF document text
    • http://citty.org/images/uploads/file/gitimebejoxixowokerif.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2a76189442f88b4676c8aa07a8f89217/jarafokiwumek.pdfIn PDF document text
    • http://veitali.com/upload/files/saxisuduxum.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161394f47e4969---zubamagufavofidaxuledi.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/49643172928.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/19176288529.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/39562958804.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_off0000eb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 18848 bytes
SHA-256: f4f189f9c0c2cac69693e49ab79b219ce7a669d27b4a48be800791faaee9ec39
font_01_sfnt_off00011c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13452 10392 bytes
SHA-256: 759ed38cdab11fa039e539fe2dc621acd4f7795b1907a03944c5b2b76f544db7

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