Malicious PDF — malware analysis report

Static analysis result for SHA-256 853d269feed42a95…

MALICIOUS

PDF

64.5 KB Created: 2021-06-20 01:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 165ed113a87c79c2ad14697a8b571eb8 SHA-1: a9cad0f1953c23b47c6b36d7255e83f2056333af SHA-256: 853d269feed42a95c05a40798923caaf64fccb98e45ffb31664264829679c2e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm hosted on compromised websites. The document body, though heavily obfuscated, contains text related to a textbook download, suggesting a lure for users to access potentially harmful content. The presence of multiple URLs pointing to compromised CMS uploads reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/1bqpb2vvep7ofcv1r1ua2cro2l/mesorateroditow.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160acf444b0cde---97355972574.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16071f22cbfce9---80968821629.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/bcbffbed15a92a96d405279760baae50/kasowitoguzazibuwesarebo.pdf
    • http://amandamaitland.com/images/file/juruparowulomenavefugof.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/5jmh7djvd7asmmfo58h0g33gs7/98469019218.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/065494c2b7e38114df780b3b4d894425/79930082000.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1a767d5f4276a58bb7ce25c639c54044/73421743142.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609625044d9a5---90694019249.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/2fd5520b043e53eb1133dcfa246ff5ba/69647416800.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/93014ee6d783d688e7e4d40d4dcc6f87/teropuzalup.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab518a871a9---43381694686.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2568271186---92867818497.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094cdfef2172---gukulapijugimuzufe.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098c83bd3451---tosoxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sociology+john+j+macionis+14th+edition+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc91.bin
6c179ec68ab4b56a6ec2cac206f554f6cfec3f4179cbdf68ae647dad731d5817		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC91 6084 bytes
font_01_sfnt_off0000d139.bin
a074fb42a4223812e21b9900601ad6ae717591e1c40691566988224410e0ab3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD139 10284 bytes

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