Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e6d6a45918c0fa…

MALICIOUS

PDF

97.3 KB Created: 2021-06-26 03:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67944718a8a3daad71db4edc1f42b783 SHA-1: 764f72c9024ca22f643b499269a60b29f178834f SHA-256: 53e6d6a45918c0faec0cbda4d3a36281f2be8c5aac91d0cac45f38ba621e7e61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files, suggesting an attempt to redirect users to phishing sites or download further malware. No scripts were extracted from this sample, but the presence of many external links indicates a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0205d49e0bdecaa17dba639504ef9ae2/miwabokukanunimonubuwekip.pdf
    • https://arvikabc.com/images/uploadedimages/file/kidevut.pdf
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/lidubudaxifewugafetogoz.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa1a0c4aa---11961477447.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b571448aae8---wubugedalemunijafoxijekar.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0e7f290a0---wuxofezatobefezanetafa.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607081d58b3ff---fatiru.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/2eb77b8645fa003c0966e311d994c96e/27440283738.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/6fa3b84f99885bbcb36b4dee9137cffe/mukaxasini.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f07d1a8796---pulumob.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/iog8ls0e9l7ik9iptfaf8kh951/juzelejidevuw.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/3fe63dd8c11e91912d06f723ec59ae64/64899348778.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808f4a75962---12470953107.pdf
    • http://panziofabian.hu/fck_kepek/lunuzudun.pdf
    • https://burstallconrad.com/editor_files/file/kadafiz.pdf
    • http://playeasypiano.com/resources/fck_images/23700216503.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba20d777c8b---11405388098.pdf
    • http://alituncer.com/userfiles/file/31941422477.pdf
    • http://poorclarescork.ie/images/zugejixejoso.pdf
    • http://beiks.info/public/file/begisovivigaresewuwuzifel.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/0c91d39424eb51d4c573fefcb60557f0/nujiwejogewanusabifarulag.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777059b2566---42667813755.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bde76616f1---99308285970.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=thermal+dynamics+meaning
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ab7.bin
9a0eac66d0827a1dd3e2e5066b838c2a17cf43ff44fd101b9869f2dd0b3c14df
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB7 17452 bytes
font_01_sfnt_off000147f1.bin
2780e4b28b7f9c3da6db73b11b7118fef8b1dcb1199c7edf499e84e461054d45
pdf-font-stream PDF embedded font (sfnt) at offset 0x147F1 10676 bytes
font_02_sfnt_off00015ff7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF7 16792 bytes