Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e25bdf4bcede5b…

MALICIOUS

PDF

66.2 KB Created: 2021-06-24 22:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 04ab0e4357decc848c7b9a1367a7a634 SHA-1: a48d6e665b1208e9dd85dc89bf5600925970c3ff SHA-256: 88e25bdf4bcede5b7a17c70c0e3f366eafa8e8154c2c55d93b4c78a2841e5f07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to contain metadata related to PDF generation tools rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a424a45b6c0---bodideraxadapivomude.pdf In PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a89df53fb4e---puduwawebego.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608246ca151cf---33448010191.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160757ae17b58b---poxus.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d3b9a4b58---tusot.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160cacced59793---85911512998.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/5995568488.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/vamowupifixozupipezi.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/de41a84617fa651b696bac4e84f6d797/26369514901.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cca13e027---23172457610.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/wozilonedijigutadubixopu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9613c1c975036eb1e0affaa2c6d5b1f2/64516486897.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9ad6cd2d0c2bb7bc3b64d5da039e1f8f/wopusumaxatopirar.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/71049274199.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ffcbc4a38---32603672071.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16078c932057ba---widebopitaxaratofowoweja.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608249fab9ee4---mexarenoluj.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/584ec86801d9c63b33f888bd476164f2/posibefigapimu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ruby+pdf+generationPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC557 5248 bytes
SHA-256: 2432d8d056a197ffb7f0406dac10a9e56582d3baabfc7220f33029ff61a8126e
font_01_sfnt_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 10768 bytes
SHA-256: 14255ebc7fcd5bac8ac8a16ae7370094005a505f1ea718dcc949a8d95cfa6efe

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