Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fedd9ede87e1111…

MALICIOUS

PDF

79.9 KB Created: 2021-08-08 22:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ab0a638b514d20b66d1112db601cb440 SHA-1: 5fcb76ecefc58fcdd26ed634fbd49963f66068f8 SHA-256: 7fedd9ede87e111133f88babc2a7d29589dca988f45900195077629306dee7e3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alliance-vietnam.com/upload/files/vonuzojose.pdf In PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e44c196eb900f88f2038017111cf2abe/pabazizuwoxurimonodi.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/zujofukamalorupuwofuxevu.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/85635624950.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964c5e1c440---77570474625.pdfIn PDF document text
    • https://medtek.vn/storage/file/40668841016.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/vitefuzubi.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/xufoxupegutipugavele.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/42902359099.pdfIn PDF document text
    • https://proxus.nl/file/pokag.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875f24ece72---xotuxuvetixetidezezi.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/35356594642.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b90787d6c6---kugobijolafixezotex.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qa5ruflpsniecsv8foj25is8id/rupabeg.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/93c1cec1894bdc23987deb096e5981f9/35864528626.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/pebanevojuzeriwuraruze.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/4817404815.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/35507204584e51bebb52bffb10d3cdee/41207876579.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad8ad004a6---kemutejutewidoweputudad.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/sukivovosanuxidifusani.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/35102312921.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/68231080488.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/4be9e8052f4143c97712a36451017bc0/9171934292.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/56037855871.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/38440193940.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/ximipelubuwatebekixoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+twilight+saga+breaking+dawn+-+part+1+ostPDF 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_off0000d19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19C 11036 bytes
SHA-256: 3c8b1f3b9eb3fa3838dca34a890c3aa1a7de6ae133c96cb803ca19769b19e6a6
font_01_sfnt_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 17924 bytes
SHA-256: 7ec46a0ecd58ea95c19a0d0a2698d5295bdd1041092d0600c90f7ebd815c1e9e