Malicious PDF — malware analysis report

Static analysis result for SHA-256 61073c1cdc775bd7…

MALICIOUS

PDF

69.5 KB Created: 2021-05-03 23:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ab7417d80275378b2f85c3842d8e9b4 SHA-1: 146c24bebed30e5fe0a598052d4bdc0a8fdad8c3 SHA-256: 61073c1cdc775bd70d5755c180159ccf954bdca0334f758b68f6587154ce4df5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting it's used to distribute phishing content or further malware. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

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://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/6358ccea8b82939aa5a2a5983205e703/bodetegemewujakinomiwoxel.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ab8222bd9d9d9c075cc8785fb5e3c84c/zozava.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/08hpr9gj23etisebrlei4b5gf5/bizefufuveko.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a87d89c0f0---pewonosipovikisunovifov.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae9884738f---58349084927.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ig9flfafff9up0kjp0a6adp0t1/20963038784.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/bkefui7nivgqgmmh08k82oe2m2/zilidedifomizagomotan.pdf
    • http://ahcxdq.com/uploads/file/031515549408.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d232c7253b---rorizimexo.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607306847bbd3---71165245527.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16074c69694d7a---zevitadotene.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/bfe113133c32f93370944b324a9436f6/82275152039.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4483bdc546b366f3da294bd2416a0201/zolorifazelijozazekob.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca93914da---luwakubibesi.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab07f6cae4---mejisojimakaza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=12+lead+ecg+placement+cheat+sheet
    • 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_off0000d5c3.bin
10b0ed6139103866c54efc4800fd75ac545f9cf7720e2b066e443911b773248c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C3 5480 bytes
font_01_sfnt_off0000e845.bin
ac8c9d228c5599ea033ee165eb59e0350cc7c4f092a7bd3921c3abaca4497c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 9708 bytes

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