Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f68aeefa5c9b550…

MALICIOUS

PDF

104.0 KB Created: 2021-06-28 20:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a2b17f1722aabb8eb50da269b98916e8 SHA-1: d52d062266df322829f143746937d872556b4c19 SHA-256: 1f68aeefa5c9b550362297209e8ff2db0d8d01bcdcc13339bd74db88a094504f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised WordPress sites and disposable domains. This pattern is often used for SEO poisoning or to redirect users to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://mamnonlittlesun.com/upload/files/36071352444.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9b76c9986---fupabaxufepavivi.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/2eb143f0e231d8eb95c551da740ce7a9/59440361207.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/ditididanifapejizol.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/70669891012.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/zejizefabikuxegikesupomel.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/81nhch34b7j5fsdtq8k509g3on/59545319603.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8e5911dd7be2259c4d1ee9cbff024b90/gixixaxizapefebuzu.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/14453846691.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/21262487087.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609757d2540d5---nefulubenotetuduxoguxowew.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160833224cd251---13729229063.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/kexixonokuluwogabibakip.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/89c38f6dd8d884540f4957b4da19e871/gilokepamuro.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/subot.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a01ff6c7352---35784655970.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/4fb2e4c5e2568e4e1302c350f9a9513d/tabawitopumosowufetifev.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608216660a227---kudoxurenumazu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b50c91b42c4---95912125958.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/c22647f04211b298cb0fcac337492be6/68358922644.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f9d8d2fc6---43773425435.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210510182102124.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9e808703a68aba97b643a136073aaa61/44735075140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=kjv+joy+of+the+lord+is+my+strengthPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/78353415800.pdfIn PDF document text
    • 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_off000135b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCD 10940 bytes
SHA-256: ae2e738885c233f0f1847dc51f67314e216d5878e885e529f9bafec4ebbd1f4f
font_02_sfnt_off000166b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166B7 16844 bytes
SHA-256: 2b57f8e31f374590ee5f361c560ec7ff8248cb1abed7ae9e0fd45f44fb162140

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