Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dce5da6a57c2e5c…

MALICIOUS

PDF

74.5 KB Created: 2021-06-19 08:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f15dcff912c0464dce353b39b52c9c0 SHA-1: cd437a21a7243747fbab35043366a064cf5c16d8 SHA-256: 7dce5da6a57c2e5c2c16b60601d20cb1533002556455438b1ae60c5d0a0a706c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to potentially harmful content, possibly for phishing or malware distribution.

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 http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160bac8a6b0334---1847526667.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/hpjaek7cgih83tj1v25r85nuoi/josopotezopexojitekikemeb.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/256c69966db7ff541819ae0ae8e6a040/9456079187.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c81d74a3c4---10559801415.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/47234124953.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/fbdab28e96739ccebedd7b8c65d956f1/85536709747.pdf
    • http://scottleddy.net/clients/862555/File/7682721698.pdf
    • http://stellamaris.cz/userfiles/29399229232.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c0b3b8e29---13775980109.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a770aded2e9---difor.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f8907e24e---47348939008.pdf
    • https://mfdesign.hu/files/file/99794218936.pdf
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/d16a3224c2b0685ce3c8255c76d4a20b/depudavinizip.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/a27120a1b3fa6a7ca2c9d84756ad3833/51752213000.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160beca0426152---15636585842.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/13079999278.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6314b8889a0649fc5da956b37194fa8/96477211632.pdf
    • http://aep-tc.com/cache/fck_files/file/28831623466.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=minecraft+4d+skins+1.16
    • 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_off0000e60c.bin
9a8899d38846dd5afcedd88bf2aa3bda265dcd2fbd2adaa091317d93c8bcacfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 5376 bytes
font_01_sfnt_off0000f888.bin
05db3d330532c19a7ce3db5bade962b09233e4a28de1c45a1b167c3a081332cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 10576 bytes

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