Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b35167eba2201c…

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 08:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ffa56b7d81eeba58237e2f5173fdb68 SHA-1: c817165827beb75df903770708e2bb2fc6fdcbd7 SHA-256: 93b35167eba2201cde100e33cdad21ff5cf8074fe6a84c4219939e7bcb3b14da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to WordPress upload directories or similar content management system locations, suggests an attempt to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://quiltingacademy.net/fckeditor/userfiles/file/kebofesatosopikipik.pdf In PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/16125898217.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/mafixaj.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/47931556599.pdfIn PDF document text
    • https://siksp.megarhizo.com/ci/userfiles/files/mugot.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/eaf8c5bd786a981a2a59d4bf2c7f425f/68415056347.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/zubolomadali.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/bunoxofevarixitugix.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b98830d28---88264364957.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/gudaf.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021092710123073499.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/89618606765.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/1951805699.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/nofekuremafugavuzuz.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/52620833458.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/jefuninuko.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161391a65e0b04---23749444159.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/mokizipor.pdfIn PDF document text
    • http://thuannam.com/image/files/58468113987.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/37041771994.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161316d119d9d8---naxagedixuzasijoje.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/rikexilesanegaris.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/51192515443.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/773k3vopcces8v6f94oli7vaoh/vopufirapalin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=video+granny+bbwPDF 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_off0000b14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14F 10420 bytes
SHA-256: 70df4b7ac9b91741bbfc8ea7f8f6cad1678282aa3d5ca6855948eaa281ee5655
font_01_sfnt_off0000c8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CF 17304 bytes
SHA-256: 0011e3e3087e25df62a28e37c3309d382dd0e502244df20ceec1117ae1ef79af
font_02_sfnt_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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