Malicious PDF — malware analysis report

Static analysis result for SHA-256 b520f31e81cb46d2…

MALICIOUS

PDF

93.5 KB Created: 2021-07-06 22:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 229cd65b75c69ac06943c0ec2c20195c SHA-1: 801542ee7008ae16e93bf31c3c5ed341709d0d07 SHA-256: b520f31e81cb46d21dd044b66dccbf8fb879c2be10331a67b067cf9b41f01c41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple distinct hosts and UTM parameters in URLs further supports the classification as a link farm.

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 https://synerhu.ru/uplcv?utm_term=blue+and+grey+quotes PDF link annotation
    • https://alatheir.com/atheirwsfiles/file/putunifijezaf.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b0fdd71b7---luxagikeduriwosemipa.pdfIn PDF document text
    • http://wajl.net/img/file/202163051523.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6bfdbd1a1---gajuzunib.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/ec3d8ec8d62adf4a57915517151c4845/bavubagerikud.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/71059593112.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b794f1f250d---limafazelisodemijowutivi.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/85e5g3b59e1rio45heukblcnta/nolofosifoxojol.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/aba6e83f9c77d5cd358909a0086be093/82814160714.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ee350afef---fadukiwolekopudofaduw.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/66545717315.pdfIn PDF document text
    • https://777mto.com/contents//files/tatetoxamem.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/87408060979.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/oevec216ugitg0p3jtvhs7rrd6/susenedugiwitivezuxajit.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa985f38cbf---porepidasagakuvalew.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/edd7oq0olap9tdp5bmjd08f70t/padufiv.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8da89df800---rupuxaxujamukiwo.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/65279609723.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d58bf1ed4---29740064734.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/vejesenaburamizuna.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/bolur.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/170544296310.pdfIn PDF document text
    • http://stevis.cz/files/file/jutorof.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdd01430fe---66336047383.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_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 10744 bytes
SHA-256: bb3925cb7d80844ed4058ec447b02cfab2c18cbbffc0781b7a7c55ccdc35ff0c
font_01_sfnt_off000123d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEB 17220 bytes
SHA-256: 8e24eb0c9675122991ce0c8af50dfef375a9f7bf484250cd0f7de0696a24d5d4

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