Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8eb39eade1059a8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 20:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4fda5bb1c70ce0cc2cc96131dd92c6a5 SHA-1: 34936892043ed8bf1f30c0ad3b3f8f2b5ee9d0cd SHA-256: a8eb39eade1059a85e20d63d171221c9b43940c9888b0819610c96ae287c571e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious payloads or submitting sensitive information. The PDF structure and link farm behavior are consistent with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e062fc6080---fupebotu.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/82asttrojfi9k1h8eau9ep8or6/25598272666.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759e34e8f1a---32420820573.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/76880943341.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/79848008239.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609aee82cebf0---fizosawujidi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/0dd802c904df0eb866dc5d8796cfdedf/kulen.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a071349818---wasepurawefomojofunoxo.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/52645504714.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f0496c73224db479106edd0660e0afa3/59780509163.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/o0ialavp8bfgrife2oecrtb558/gipaf.pdfIn PDF document text
    • http://chapelguild.com/images/usr/14162173535.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/gisixesesurabetegu.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08d96b1e6---bazabagoxav.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/bezejavibogixizipamexim.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe9e3365b3---kilobitawozuxilu.pdfIn PDF document text
    • http://africareview.in/userfiles/file/56495768484.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/jiqgd2jus0iaoj7eeec1j7c8ci/68610176239.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/loxoperesaxuwigewetavoze.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/xugogorilerog.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1fa118a9c---73842827634.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/zixipepezusaxixoduf.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/lipalun.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/79190589772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=schizoaffective+disorder+case+study+pdfPDF 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_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 10980 bytes
SHA-256: 42ceaa5f661c2778688d7c7cac8ac33e44fb3aedff365be6614261b7426bd150
font_01_sfnt_off0000f1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0D 17140 bytes
SHA-256: d4692a2e049f3cb78f3bfe3cb79eaf6f0c958a6a6f16852b1facfb60aa0be70f

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