Malicious PDF — malware analysis report

Static analysis result for SHA-256 d60a074f009bae78…

MALICIOUS

PDF

88.3 KB Created: 2021-09-01 13:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4b374a6e98c476e2ac82241fc1ad397c SHA-1: 25fac67d012e2d69690785b5756c8a312ccfbfd4 SHA-256: d60a074f009bae7803c45cbcbcf0e5cd107698ba4aac728abf4464de11957267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content or phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, suggesting an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://slesnick.net/userfiles/files/nijumipawo.pdf In PDF document text
    • https://activepymes.com/pub/file/29017672144.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9700a97a2---7611557483.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0vuraobho2rmnmesu9aur0aeq5/13621608448.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/87998033237.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/16602963669.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/xojalixaletozezovowovugi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/59769050185.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/vshgm8n60it8uh2j037ocvc76r/34594826661.pdfIn PDF document text
    • https://artbynela.com/uploads/file/33818819021.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/fanufuxiwojujukapozo.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d1b83b4f596ab02b6df6fd152c732d02/nipupuzoti.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/10048773428.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070f9e1822ea---23474880403.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a18d8afbbc---34762950017.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/5bb7f7551ad3f1958e63d5f29c6553fb/20006929099.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608af9e09dbe0---gudokibupale.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/61f2f5d9765eb71d6ca2155621bc6132/35856283426.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/mufadelunabexijed.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/22623891848.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/10440832015.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/748a76de0fc89e050e153f7e57e0c298/gatelep.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/51073607328.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a0774f69592c687580b8466991ef0b85/nogigasirugamix.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a6ab1c9934bb6a4256871ef91dd5b8b3/98524088293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fallen+for+someone+quotesPDF 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_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 10504 bytes
SHA-256: c19da86f9ab3ebc7b10fa4173ba6e3b10bd047af941cfe979ce1848e1f8e3b61
font_02_sfnt_off0001230a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 17800 bytes
SHA-256: ca8a87bafbf93d39a1fe879446607a30722e3c8d91e1194c3b452d5ac31d7e46

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