Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f063e4d18e0460…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 06:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b97ae1734a2916da55e4ecbf68923e45 SHA-1: 93a7813eb68e31a07d237d0daba147599598eb24 SHA-256: 36f063e4d18e046091dccad1ee122bd8ae05af5e5cab8379b76a4586920b308d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccab97071c---46587992147.pdf In PDF document text
    • http://balone.net/_upload/file///bizidol.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/kaxasezoguz.pdfIn PDF document text
    • https://dacola.com/upload/files/1648607584.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/b9ed95ecc15c6700be0877dde3b54e97/mosasemenevowipubovotemem.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886a3ad8576---87581551612.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/7f466c34332cf517b043a311147ade11/47331499881.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/14801452867.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a77ddfcffe9---20295295488.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c24a523c311---70215630931.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/97744751780.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160999bb15edb3---94005358402.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a789cf2c02c---1309217469.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/12581884696.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/lofowokivasinerisekikodeb.pdfIn PDF document text
    • http://edelstahl-berlin.de/media/file/15104115588.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d9df3ab51d39ddd1a419b0804978e121/bonejokimozotenatejavana.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16121c93ba3ad9---teliponavaditisojoref.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/84433710259.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccea76c5f6---tomoni.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/xunilixadipibuvisejora.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210728_104459.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/nibuzipevujavedapivofaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+does+tsk+mean+in+textPDF 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_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 18048 bytes
SHA-256: 7371b34b688c0e2d4bc240620c425bf21b060741744492b9f6a7b73387f5f737
font_01_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 10552 bytes
SHA-256: 97f010a7d9ae886c79b768e12cf95be7eb667a0ef2d87321644f8ea48a19c1b3
font_02_sfnt_off000127be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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