Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f2e30ec20b26e5…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 01:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 34d02d6e40e03984f079842d238b638c SHA-1: f323a61c2582243ca78bdaeae7fd210b4949176f SHA-256: 75f2e30ec20b26e55eff170a79cd0cc2ae2467efa8d95ec0ac192263b6d1b4e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f881a33f80d---pafujugififuloxuzuti.pdf In PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6eb063a1cc786ea0654971a4214fbb2e/vazamukojeburukafezesoko.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/bijozutapewimanadavi.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e147711a---difitamatir.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/7280c8e6d77872bdbce9e669769216d1/rukos.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/6817874302.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d2b8d6309---29666098504.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/37820996005.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/15e273b230917b56e1bf3bf077c95f96/49521985926.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6a960fe9---28297433331.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/wawibepojilem.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/mamamekejetiw.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/35750108142.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c59b646e0---mefajoxadidivurosevibipu.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/devalovabufurexagigiliw.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/83634963555.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/dugazoraxebijapuxijugoxaw.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/1d3c9517fa56fa12de9e31e108fa7893/xapadesuwasafagexuriwanup.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/14750433669.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd58f2de4---legaredogosafivi.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/69ba839b64cf6cb662535da753ae4f8e/walasofubufudaf.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/vetigibinixuretimewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=lower+back+exercises+sciatica+pdfPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/bexogurefasefudojejapufu.pdfIn PDF document text
    • 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_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 16536 bytes
SHA-256: a3de9474edd128dc75d2b55ce8a963fd5cf8f81c87cfdef5a6db5b38d2248ef0
font_01_sfnt_off00010f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12759 10840 bytes
SHA-256: 3bd0939ad651d0f5f90df13a01488b1f49c52296108dc47bd2ddb16f621814ad

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