Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b02b86861e1b9d…

MALICIOUS

PDF

89.0 KB Created: 2021-07-21 00:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cabdfb057c3b0621dfe6d4882dfa9cbe SHA-1: 8bece38411adac220a40956119d5fe0e1988c324 SHA-256: 64b02b86861e1b9d69b33f58c4aa35d026fe8b87b986f234929990acc3c2b402
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://delvalle68.com/clients/54584/File/vazubebiduzigubawegi.pdf In PDF document text
    • http://alibabashipping.com/userfiles/file/pivewikizugu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160894cb24b3e2---vipazekusogugoma.pdfIn PDF document text
    • http://industrialdevices.in/uploads/83189262040.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/50520712433.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/favevonamarelixap.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/zukaxazeduno.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b04a500e6---gigazitogi.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/2cngn6spephkem3kvsj3vhb7gj/69931605383.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1ed951650b867655b53538f3ac7b924a/vadawenotusad.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/db8cf6be565b076eb477587c6e155799/61694743795.pdfIn PDF document text
    • http://jar-ted.pl/file/nubeponikoturejovapopamu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7314da80ef---lofijekikulawenofefak.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/11097282884.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/bbc83751c8f2074f1ab0a958819fe0d4/mimebabuj.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c349ba9f2680e63a1a25bff6e9761ef2/76691308981.pdfIn PDF document text
    • https://linker.tw/files/tefirowadonibabubijofor.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/wumipojatejekise.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e1607981fe7---74084512170.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/2c4734f123941af8375c64feac3288dd/kigikatolalipepi.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/8925e332155efef219291c302995531c/39578199587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=advanced+excel+formulas+pdf+with+example+2016+download+freePDF 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_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 11684 bytes
SHA-256: 7efa6a3ea7b562723525393a5197d6259218f376d7b0dcad3544cb1fdccd24ef
font_01_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 17548 bytes
SHA-256: c49018b1b61864a0c2f2869dcd8d3a08f496335392f52fdbaebbe562c4018fe6
font_02_sfnt_off00013e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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