Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2850355a87567f5…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 03:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5cde44afc81ebf1a14c4468e0a7dcccc SHA-1: 5f467ca74010a47a3250586f5a5b7db4764998e8 SHA-256: b2850355a87567f5ef7a8cc07648f3c1a25ddfd28824451730cac6653e412d8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://csc-020.com/userfiles/file/20210630050757_7wm8vp.pdf In PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/fe026337b121375e7af3f60372eb94c6/terawatonubu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b8e35aa5b---37552301926.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9361f19df8---fipabogukixujusizavo.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607935fd6bdad---banurevevisapafisodejobij.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/85192369139.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/34976473629.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/93770595044.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/zukan.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/88867714e58580ecef4b236db45d03ba/tejaselijigijisitetugabef.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/41115946828.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/44624338879.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/epghofv5li5bd2nmjp05jrpdvb/nabesoz.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/60917229479.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/66820732464.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5951b44e8---1376123887.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/80203787c15612fddd8f395e9c8ad53d/70250005530.pdfIn PDF document text
    • https://forumsevens.com/images/file/78591249316.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/xinaj.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1f58efc6c4e5752b3afd26d70d49e13b/nanomakig.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/uojoqbc9snrdrq0aqkkqag7r01/6493851388.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925267cb384---damaketokotew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082797bef3fb---tizovuzepomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=article+writing+examples+for+class+12+pdfPDF 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_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 18304 bytes
SHA-256: ac339e8344625c7e34b94166ec672ddb6af81103aab7dd5ae55fcece55d08442
font_01_sfnt_off00010f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 11304 bytes
SHA-256: 09f9452deced587673c50c1adedd0926bf5763fb464376ccf454828ac6d641ed
font_02_sfnt_off000129dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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