Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb17b1da85c0074…

MALICIOUS

PDF

72.9 KB Created: 2021-09-05 00:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 92583de64658970c92a92b2f947a980a SHA-1: 6d43fa39a6e68f6caae62f762db376acc47c6464 SHA-256: dbb17b1da85c00740d0671c94d35a61af3c60d169fd53c323c2192a9d658a162
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress instances or disposable domains, suggesting a link farm used for distributing malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

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 https://oniceh.ru/uplcv?utm_term=toyota+yaris+2013+user+manual PDF link annotation
    • https://vhssirimpanam.org/ckfinder/userfiles/files/16468974707.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/34338009120.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/ruxuxisemi.pdfIn PDF document text
    • http://berbun.com/user_img/file/60555685533.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/pijidedux.pdfIn PDF document text
    • http://belean.pl/userfiles/file/jagofizawoz.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210725_AF390934D6FD3568.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c432898e41b---50981926590.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fb489b8fb09b7a3b99278a42c01983fd/55071829219.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610079f5129e4---sodineperogiterevajabulu.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/dubepefuxotopumodi.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/digenosupakesoz.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/13005743107.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e22cb20ce9---6340938091.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/dojakoran.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b78bba3045d---delaxewapujokelikuzen.pdfIn PDF document text
    • http://mousike.it/img_ins/files/temuvamabijamate.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9ea32fc98ae2ca3ca9b4cf8cca2f8aa9/wiranipodifujarivuwi.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/xejanurusosa.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/84684361956.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/61983369697.pdfIn PDF document text
    • http://strandedtattoo.net/file/74293704667.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d36db0a0628---mekipeveg.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_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 17660 bytes
SHA-256: 3a9f86749a258f6b07f7949a77ac0c89a892b780269e4a771bfe0e921024a1e4

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