Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a62e0f91691271…

MALICIOUS

PDF

92.3 KB Created: 2021-06-29 18:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 02e2b305f92caa9e869142b19f824480 SHA-1: b4c601f71c7234a0b87cdfc19d48ac70470969c1 SHA-256: 77a62e0f91691271f09710070eaac74495dd6552fcfd2f61ea2c217285becb84
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://daming-school.com/userfiles/file/59528665051.pdf In PDF document text
    • https://vildmarksjagt.dk/userfiles/file/zojilipalepo.pdfIn PDF document text
    • http://techbis.pl/files/file/rodipemenisulujuxadoxo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/rarf9m7r21gdr82fg65k8pstlb/58742365180.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/i29dlghpska5piobsm9b0s2v4v/sipimir.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607576d6aabbd---17144917206.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ibhbl32naobk00cbhc443fb7g7/92402933399.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856c93d7042---mitodav.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///6277505075.pdfIn PDF document text
    • https://digicpictures.com/downloads/refoxurovap.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/jiriwuxabirapedixil.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/a5d3d1b75d349664a19f5cad37f19c5a/67607814622.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098841800fcf---zanigep.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983fa24a4ea---nunubupowimefomadiduxupap.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082acf9dd04d---44601062264.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/16526546090.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/mivugenoko.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96d02f487---rikizutabufemon.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c1f0c68c---16314632571.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f3c884d8ea553e6933cd0f7ca5cf6581/87417808438.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/ec23451bf9b68285ed14f7396ca7f0f4/xatefubebep.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/folj4jun7kgv9c9k6g84fkjsgv/zukipoxazajo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c706ad52e---19339936819.pdfIn PDF document text
    • http://dgjst.com/upfile/file/kigipotumoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ant+man+and+the+wasp+quantum+realmPDF 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_off000105a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 10756 bytes
SHA-256: aa63e03c7b582254802b9afb71489e9e478d52d10a46422c1f1fa7cdc1937d99
font_02_sfnt_off00013612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13612 17784 bytes
SHA-256: a84c7d15bb7d97e317c7dcd06e2779fe96b6687ea115fd59f99a01cf15ea290d

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