Malicious PDF — malware analysis report

Static analysis result for SHA-256 473b0c0772ced931…

MALICIOUS

PDF

86.0 KB Created: 2021-06-30 11:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0cb8f5338c3d47ceb8a9d2d701f28ebe SHA-1: 81f3c1bf87f61f04b9ab6f96b5b733ef5a7821e5 SHA-256: 473b0c0772ced931f177b45ee6983607ab455e1ec51ad883564b4540c4687b2d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress installations and other disposable hosting, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca7486d81---95094417652.pdf In PDF document text
    • http://danfilenemd.com/clients/67744/File/belore.pdfIn PDF document text
    • http://sushi-belovo.ru/files/20911994360.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160be1cfbf1b42---fopavux.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160703e1202821---89633109830.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/romufuk.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/rupolizumomixabos.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/30740724505.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/8303fbc52a1df2241227204b3195199c/74008714841.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/fupirodaluvuso.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094e9ade91b8---81412023733.pdfIn PDF document text
    • https://chp-travel.ir/data/file/90712803292.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774f1839d13---28202026760.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/lalinesekokosumovo.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/0d9159fb71176dc67a7008cdf09ee9dd/91662555834.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/kapazuxafegufifidelidiko.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/xenogekudixowolefolikalur.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089e98c7e2b6---bixoselevugewusipu.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/73657325095.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/razizewelimajumuviwabis.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607268c8342df---kuvewemizavipusumigizug.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6h38tdpplnt9cgo3da2jbval2s/86683726922.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086148924990---watatibofokorodiwozad.pdfIn PDF document text
    • https://people11people.gr/uploads/File/78482734833.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/du9o6f0kshg353kf75d39ikg27/pumojak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=by+products+of+aerobic+systemPDF 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_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 17112 bytes
SHA-256: 4dceaec94bcae540ae95f4f87af9bfb8ef56005bcac826258214202cbd8d3887
font_02_sfnt_off00013162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13162 11040 bytes
SHA-256: 8e327792fffbfba952f96c4d4d5bff1f3b102f4aaa3d144f15db4457aa18996d