Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97588c6e54f759c…

MALICIOUS

PDF

72.3 KB Created: 2021-09-07 23:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fb8f7abaef8f3f30efaa5bc60e20cbf4 SHA-1: d33e0e2ecfccc9da036452e4e4d6511ccc9793d0 SHA-256: b97588c6e54f759caac172b9eedcba84095782e043f36f2481898a181136d329
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous URLs are embedded, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a phishing campaign aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://nomylo.ru/uplcv?utm_term=penal+code+nigeria+pdf+download PDF link annotation
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b483d06735---zilamemepabanut.pdfIn PDF document text
    • https://congchung7.com/upload/file/pafepagaliwitidusugilanej.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/3iopg5vf8oulbkggq0fhji653v/sezenidukovezawekemo.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///begurawezulegaropoxemil.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/7516740569.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/32518252102.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/76511578421.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/podalemusomi.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/40403126788.pdfIn PDF document text
    • http://bjjiffy.com/upload/jemasifenarakubutagerem.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/9351561555.pdfIn PDF document text
    • http://uchid.com/uploads/file/83882405725.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/wiwitaromepibonewesadi.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/72356155381.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa00142e8f---9629704271.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/badumanuwolebonija.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/doradujorobusojupirera.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/dugotigatopudabarunodow.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6645b8db---depuvobos.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/18222112906.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97958543642.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7b98f07339a120c67ec8943909550cdf/zapajitajobaza.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b85bf2d96e7d75062d77d1774a6126c7/26794380014.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021081001525010.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/nojotibaxevixeda.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_off0000bb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 15788 bytes
SHA-256: 234ffe28d971c2df57b6ca52e3fa855e0edea6f517c668dfe0f66d97cd69b306
font_02_sfnt_off0000fba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 10616 bytes
SHA-256: 7f0fe0645bc1dd947434157cf0e06e4f6230cfc7a26125841493d1346d14cd26