Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc11535dfd6ff97e…

MALICIOUS

PDF

69.3 KB Created: 2021-09-11 12:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d2beddde209f2253e4dda9086861efde SHA-1: 7e3d55def19ef67a598615102013da47017fcdc0 SHA-256: cc11535dfd6ff97e970ab0a92031bbed310d8435936718970e4e3da2617b9542
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or 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 multiple links and the nature of the hosting suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7670

Heuristics 5

  • 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
  • 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://mylivediamondinventory.com/uploads/files/wovorazivufi.pdf In PDF document text
    • https://mvmdigital.gr/files/files/63421476695.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/kalebigemoxutemedawalubu.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613591f4a287e---19348706514.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/xolunajowisepuketololose.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00721a275---rusenoxulaf.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/medovu.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16313381618748.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/fobel.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/43232243500.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/lojetamedojuvo.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/ravijegonuvibofi.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/65972341155.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/muwivaninegoviremugedefub.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/9485234141.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/44543836894.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed5d688f92---4742504266.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/magoxow.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/27162077889.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/mefanabutevegewenofixoxu.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/6629310213.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/patogubigiredek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=free+robux+obbyPDF link annotation
    • 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_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 9864 bytes
SHA-256: 54a699ca8965c01c71f8740e249f8b8590ee9cb1a4e78b71a57add68ce46ccd9

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