Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7ef5f4ab326a4f…

MALICIOUS

PDF

93.3 KB Created: 2021-08-01 13:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6fa37b9968bdcce429125c58b3009690 SHA-1: 19a16131d1ffec88f157140f1239f67914d0430a SHA-256: ff7ef5f4ab326a4f078848a969e7d11851fda5d8bebfcd118c3b9bc139a038a9
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised WordPress sites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or redirection to malware. No scripts were extracted, but the structure points to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a322677f---37117051660.pdf In PDF document text
    • http://logtech.cz/foto/Image/file/denujewakuw.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084845504198---jomaxa.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/60767137394.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/df694bgr2qfgqlce3qlgp9k1dn/vuwabopetokewofedaru.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/nezeronatojalekodukop.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/hn763f3e2n1vnpspoua37qno0m/52194947143.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/komukokilijigadaraminevuv.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72772becd2---fexisenuvikutiji.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/bekasoruvubojas.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/36399082089.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b191e025389---97702927281.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a94e00bc3c1---59645899430.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/rolobatojer.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/81655783229.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/60174740452.pdfIn PDF document text
    • https://w4gw.com/file/gujodimutanatu.pdfIn PDF document text
    • https://limsurempat.com/contents//files/58178035302.pdfIn PDF document text
    • http://krzeptowski.pl/file/xufiwazenevaremos.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160796f2ba02df---62955021917.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160912dfecc0b0---65965865206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=clash+of+clans+android+dns+serverPDF 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_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 21316 bytes
SHA-256: da9bbd708e93fd57db0e0da0c1fb8d81e9e9906b0573c0e1e5a986d1f2e60ba6
font_01_sfnt_off00013740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F57 10572 bytes
SHA-256: 3d861d2054e39950a7535559d13c250e7d1838dac7f28d5b9b7714cb01ca8e41

Open this report in the interactive analyzer, or submit your own file for analysis.