Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed6d2619e216467…

MALICIOUS

PDF

89.1 KB Created: 2021-07-23 19:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 82f527fff7b9cdc269fdd83d44f7ca4b SHA-1: 0e62e1c75eaf27d28ec880d0529bd7e2133e9d19 SHA-256: aed6d2619e216467340ed3cda475536cff71b3465e1bcef51d3e5c8c5d638d01
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it's likely a phishing or trojan delivery mechanism. It contains a link farm pointing to compromised WordPress upload storage and presents a deceptive download button, suggesting an attempt to trick users into downloading a payload. The presence of multiple links to potentially compromised sites reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160733df0446ac---74171472029.pdf In PDF document text
    • http://hydrem.ru/images/file/47590566578.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/tunofijemetezo.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/delapitulixasepuzawor.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2af668b5cf---labomamufimagesijog.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c6a73948e---32561546744.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/01b1241564f60a7c2dbf7fd27c0014ed/zawijowelanimomesut.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/oqf96v2jjsve7tojuvm9gd1t8g/pusibebegulugujatenuzo.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/doxalufoleget.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e11709a37---25504958040.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce189c1b69---bawed.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0e1e25cee---55363058418.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a56c9a1b56f---tatov.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/xogufubovul.pdfIn PDF document text
    • https://blokhol.com/upload/files/43334930694.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160788bef5c45c---xiperikofuvaxugevonu.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/mabavoxuxibavil.pdfIn PDF document text
    • http://simonide.org/userfiles/file/gimoligusojesiwudil.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d5557b1ee---59684338219.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/19361970486.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c50d88c76ce1c8d0c01361baba917ed7/koguwuvadidogegifemekike.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/taledig.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/fifigumato.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098c47d5720b---nilovuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=kabali+hindi+full+movie+download+filmywapPDF 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_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 10892 bytes
SHA-256: e61fe76e86e2af8ef7df3c453e5d075750d141de290b6aa76909bdbf9841d49d
font_01_sfnt_off00010e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12691 17588 bytes
SHA-256: 1e5782546c5800ebbb6c583aa28a6c57197e383058d912842f7f650b9b82e6e7

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