Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cd44dadb7dcb21…

MALICIOUS

PDF

90.1 KB Created: 2021-07-29 21:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 08a88a6ce46ee6ae9c7cbce97415859b SHA-1: 15ceb65397cb43980edb9e054259e7a4640d715f SHA-256: 52cd44dadb7dcb21f9a4230a013426532c815630adc922701e132e458fab2bd3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farms strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7161

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://ketchas.ru/uplcv?utm_term=caliper+test+answers+which+tile+is+missing PDF link annotation
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ac484439d72---pinisexep.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9741a62b7c---77049779723.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d91fd049012---4488998853.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/momawekapazuwuzanuzomufi.pdfIn PDF document text
    • https://serka.com/serka/upload/files/gofalupeziza.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607233006f593---girobirolerepataze.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b926d52f42e---49467750209.pdfIn PDF document text
    • http://tulsamemorialclass1969.com/clients/8/8b/8b8b36ecbaf17f244e47af75a29dfbe2/File/dudoporoditin.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///219292093.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/4e17c648cb16b9ff556d37fcc88063af/61281268271.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/zukonipodovanuxegu.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/89904979176.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/tatavuxufubijoko.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/71338072886.pdfIn PDF document text
    • https://airbays.com/userfiles/file/91645256480.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/lemidumafa.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a03aa7b71ab---62207615363.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/96788797336.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d0017a296---kerafirabazurosoretazivi.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/98710182275.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/6a76a6a3ccdde04c2bcecba97c932505/wekepowuzofavun.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/tf25k9j1v6l131gobrj4rf53a1/65176511288.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6e929e47c---birugawazomo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A5 17872 bytes
SHA-256: 4b51f11928f111bdae0520b43a824ad1ed11ece6aa5b114bf8574667d1159c84

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