Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e059b135455f364…

MALICIOUS

PDF

83.3 KB Created: 2021-07-25 23:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4104645088b5b3bf16fffffaa0b0a8e SHA-1: 560341ea44e45bd2447020bfd2b8890ae2396f2b SHA-256: 6e059b135455f364d91ceb494d0a0ec0017f8187e04c28ad1a4debf9aa17e329
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable domains. These links likely serve as a lure to download further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/753598e80e550debf0f4563458555c7c/1494555014.pdf In PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743ecf4f90e---18208110760.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/13928053266.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41a14d007c---xoromirexekazawevizokuxox.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/da90248710e151a6104af9806f8f7ef7/33057290198.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0549aa6017---zalalobuvegifosobum.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/fbcf204f2413ca18acfa8079b99dfe1d/43223826558.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/50874717639.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b718ab629e---64573518204.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/ec0eb95669ed94ff366191033cb36f19/nimefenuxavedu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sajarijojelofuzenofopoji.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/24165316353.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9285623f8f---65017181068.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/wabuxewotur.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/7f9ffb2f7ec950651a92562d868ac8dd/26772742172.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/jijimufol.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/fapekifulaperen.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/536213505.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/bobokadofe.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/24098896621.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/rafolivavupop.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/83405996498.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/u2o340fu99r0rhjqabgl78ip8s/fabavezewipokolisekutuvas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=where+is+the+keurig+2.0+water+filter+locatedPDF 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_off0000df90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 11232 bytes
SHA-256: 610e1d14d8e427b7466a74e80ba125cb470f3396caaa1aad69d5ba5298432c34
font_01_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 17300 bytes
SHA-256: 34ed2868735ec4a998a32ab4243471f1334379644bcf2f66ab0e6b1bad97fcad
font_02_sfnt_off00012775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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