Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3a6e4e9d3e8330…

MALICIOUS

PDF

71.1 KB Created: 2021-09-11 13:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 028906096c19a8bad8335fcfe74f3684 SHA-1: 4ad402a9ab6fc7e2f12884caf93e006eb3708d96 SHA-256: bb3a6e4e9d3e8330f1fb02e2f6712e42bb49e4bed122242ab9b044f882eec6db
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files hosted on various domains, indicative of a link farm. Several heuristics, including 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware, hence the 'unknown family' classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://sdv.sk/userfiles/articles/file/96974855625.pdf In PDF document text
    • http://dribblebar.pl/userfiles/file/figimevazafofegokibenu.pdfIn PDF document text
    • http://huefpdf.org/upload/file/32546779768.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/44291873376.pdfIn PDF document text
    • https://biocoils.com/img/file/21281246739.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/60081823458.pdfIn PDF document text
    • http://devison-matras.com/upload/file/rorenesadofevuzitonup.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/rozodiwejovamepebuteso.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/46159623353.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/fuvutukesarudabuk.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/49057196277.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/tolovapeban.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/37696893113.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/tukubetaxufogebim.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b6ab2d34dd3714feb9ce79b792079481/janekenedikitexol.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/makisegufasebezogute.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/5785191135.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/bivagunigumub.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613331f647c3c---98670674883.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9f76ed311---69771368986.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b07a0a5fb---89263427166.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/14735298738.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be1c45be43---modewukegabimesowiwebod.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/kd2teu4hnrf6p18hmcfvm52atj/dorevunikaxitadedefesevu.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/xetupelaki.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3e55e1e2fea1ab59c73ed251352953a3/4381642207.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/14314586807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=zenonia+4+apk+modPDF link annotation
    • 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_off0000b62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62F 16496 bytes
SHA-256: 269a79f41f71e33ee926414f537ad9f870cb08eca7e1dc620b33ce89690ca6ff
font_01_sfnt_off0000dfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 10272 bytes
SHA-256: 7246af151af1494107ffbdc4437d8b58d01f3e6b89e4804df166429f786895a4

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