Malicious PDF — malware analysis report

Static analysis result for SHA-256 763decd804ce303b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 01:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e7bf78919374d6aa7e195c6e4e71bd16 SHA-1: ae59f9ede4e5543ac3c6355c9d36d16d1986021e SHA-256: 763decd804ce303bc241110843757f9b319d29fb446fe46044d97215f543d16c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wisujibulugireriwuduxo.pdf In PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d9bf7d70c---gizekejetapoxis.pdfIn PDF document text
    • http://azizolace.cz/images/file/nuxezevulotavimopelibitem.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ccf61b96f---wiwuzofaxezo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0e88ac7f1---40812106611.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/dcb53b1a7875b10ed8f9603de9c1b2bc/fagalanages.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/b561d2fb5176c250d856f46016aebfa0/wofuv.pdfIn PDF document text
    • https://ibextrail.com/editor-images/zozat.pdfIn PDF document text
    • https://s-h.cc/uploads//files/202108020936039227.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608526df0d621---45531014999.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/38147739135.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/namasepebipagid.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/6920906332.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836cdd31928---55418778637.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/82915477bbba4967a1ecf9c9a43a74fd/kojisuwubibituwokipoxar.pdfIn PDF document text
    • https://digireg.lu/upload/fugabetajujakusotodimubi.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/23027168065.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/wital.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/icf79o3rkobo3sfkm64s6j41k4/28202988470.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b1351e508fb304d9e163e60ec884d121/66104558004.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/67778861760.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/40580474105.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/828552d5a8716a42a21427e7286a7607/82127673043.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/98172348387.pdfIn PDF document text
    • https://menu2uplus.com/images/file/45622476322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=yuva+upnishad+computer+books+pdf+free+downloadPDF 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_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 11352 bytes
SHA-256: e47191aa434fe61d14e7f873df52c1fe277e5835b5aea71580e951a165ea17cb
font_01_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 18976 bytes
SHA-256: 2bc7acb03b7dc1ba51cdfee8aa8ff8c116d3d1e1255fa5e40173c307f080ecb1