Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f33e5a0d3e9f60…

MALICIOUS

PDF

75.3 KB Created: 2021-07-07 03:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58a9e4ce2c55bc5dfcd814bad18e3f32 SHA-1: 82f17ad84156ec41d47f82aa6d82436f8899b5d5 SHA-256: 48f33e5a0d3e9f60a5c3db8cc9066a6415100be0fb467b7aef05711c3ff57fb9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/36e8476e920d8c44aed2532f19b27832/sedisa.pdf
    • https://sportsht.com/userfiles/file/60777459585.pdf
    • https://mvpartners.be/images/uploadedimages/file/15345911362.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c513c69b4ad---jojabumubo.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/susalodufatolit.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/h3edptpi46p3umlg3lp6svuha3/xaponogexanaduwebuzepas.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/1335041381.pdf
    • https://rowadalbyt.com/userfiles/files/mobivupolulolefizunilavof.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/867657601.pdf
    • http://ashioke.com/images/library/File/gaxexanijezu.pdf
    • http://st-ark.it/userfiles/files/zetud.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/d044efc2d285eeb88c59e450feed2e75/99421618027.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2999b979f---xilosagegunojim.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/432a8c8d8db9906fd3d44d32a782f30e/34667974343.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8762d5df---96267725818.pdf
    • https://feng-shuiworld.com/userfiles/file/wivubazadupu.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160884ab1d0278---lidep.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cc76e64b3---mazelelurapanomunurakuwo.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/af678e1facd3cabdeeb1a6fa435caeff/rapetezivotasu.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8ae7def0---62540314935.pdf
    • http://lawngo.net/fckfiles/26873619042.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dinosetabatelarupin.pdf
    • https://a2designbg.com/userfiles/file/18622644139.pdf
    • http://edu-family72.ru/content/images/uploads/file/49005044324.pdf
    • http://yangpupark.com/uploadfile/files/xozutilizub.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf6e43ece---powagebedosokemupisarewul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=words+ending+in+tious
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c35e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC35E 16792 bytes
font_01_sfnt_off0000db70.bin
6d39358f5b279007eac39e73a1fdb4b8648bb0099ef59caba3065f93a767a444
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB70 16988 bytes
font_02_sfnt_off0001076c.bin
3fb18399a176734c115773aa9e3be8c207ae0133c17dab0f95d2ea83de17aec3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 10308 bytes