Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df8ff0d7a85d0bd…

MALICIOUS

PDF

91.0 KB Created: 2021-07-07 22:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 685430a5b4043405da94b866128fb395 SHA-1: 5e9d579ee32b293b1d14a402a34cca936207f19e SHA-256: 5df8ff0d7a85d0bdce8effbc1f7ec29178d8e81e5c6b0380acfe80d75fd4c282
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to host phishing pages or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed52cc8202---38623411456.pdf In PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/34d9770cfffe8629eb6550f7cd088d7e/gudigekimisovotojamitu.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160847d6282272---kabaderiwek.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/81563d6d84c8b96f1f4c84f332653f25/15073398197.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/73078873775.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/gr572bbgjrpg65ibpru5nqo7ic/94792392829.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ihl0pnc4btmo4iu88aon82qa3g/fibofavabe.pdfIn PDF document text
    • http://metrokentakifinan.com/resimler/files/90891760863.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/96343460034.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/laxikadafowalivuteja.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/bejizunow.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/nabonexolalivarogozurezom.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/setap.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84665fe09---poxexuxosow.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/73135890451.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/6391760100.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/8705546790.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/lawojivepaboxamumuni.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/pakulirozubibizave.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071d496c17b2---26734767319.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fab756bf07---kufusirunavojiwa.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607400ea2fe76---fukawezifojapeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=adventure+time+snail+locationsPDF 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_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 10676 bytes
SHA-256: 322522d8fb5b61c3531e39e3cfcdb4680e10749fc11492592d70b8ff366b36ee
font_02_sfnt_off0001317d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317D 17572 bytes
SHA-256: 17cd025d22df921d5269d5418208d0a62920ddd52593782b8933039f7531a906

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