Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fb32d4907ad2d4…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 14:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba79486b55e3aaf9cafb506c340f2cb5 SHA-1: a2a2f12b2c18134857c430b3134307af0896a7d8 SHA-256: f8fb32d4907ad2d455ce4a92e793d05fdf859c4ad797a86a2fc9e6010df2bc19
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The presence of numerous embedded URLs, many hosted on what appear to be compromised CMS uploads or disposable hosting, strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://hopclickhospitality.com/scgtest/team-explore/uploads/files/86102537393.pdf In PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091802030971.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336c70416d5---tojezajobapuzemujatovo.pdfIn PDF document text
    • http://strap.sk/uploads/files/jumuzive.pdfIn PDF document text
    • https://proxus.nl/file/rikafunewimuwebofe.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b3a8ec807ceda49fdb823c6e84fbd7fe/77205263197.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa8a2935e---senemefiketewutezedit.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/6346191925.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614362ddef4d7---dapozananejox.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/zemolap.pdfIn PDF document text
    • http://3sdent.com/upload/files/firutomamab.pdfIn PDF document text
    • http://consade.com/userfiles/file/domuwakavajivutegulev.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/nowowejilijaxufe.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16147858ded1e0---86225624661.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/kiwibikisaponojekimibo.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3840b5580f589e49c706e26e007f969a/88201424873.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/87383623586.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/56359138085.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/lojedukejuxev.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210903_165613.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/xibitelixetovozos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=backup+firmware+android+tv+boxPDF 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_off0000ae9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9A 11204 bytes
SHA-256: a2457aff033afabd22f78d8ceca65437a088ed26103c7b21f00e0e8a3e7dcf86
font_01_sfnt_off0000c8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 17660 bytes
SHA-256: ee8ff86d71bc5ad5f71e96d9b5ebf15469e970532bf4ca5fae423fa13bb67eee

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