Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c8b9efcbcab4ec…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 16:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f8cc7513a0648fa51392387df1483c83 SHA-1: d126261c07dee0f5313197701677c309d79cc7d6 SHA-256: b0c8b9efcbcab4ecca8bd7059e9c0dea183c21f258d8196539c5764475ef48fd
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and a deceptive 'download button' lure, suggesting it's part of a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's designed to exploit users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://antasboru.com/guvennet/resimlerfiles/goxalodaxapevudo.pdf In PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/odecf9uf15um9flndr0s8mg58q/gitapisazono.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a37d611e7---3852654081.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/8e7475a778bc5f81eab89ad315a09764/fatadixifabasujovapi.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/jepenijutabonuwobaz.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/fb04a179d6754a98ada7f76132ec5a8e/vetipijexinozesa.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/803041773.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/daussso2q4m4846nu23nc9uss9/rafalidanatiz.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/rupimenavikabud.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/716f981b21f65b96f261da2e15ed4d8f/mevisafajexi.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/6c8jbogv50o35va04nq1vleb2i/920602104.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/43961252705.pdfIn PDF document text
    • http://bienbao.org/uploads/files/maxetepizuduzomufeza.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078144966a4c---kapulejonotabu.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/88617777813.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/xilogevusinorevituw.pdfIn PDF document text
    • https://basisnomor.com/contents/files/jolosinovo.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108180744278786.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/jinan.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/fifedidajibuga.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210528195901.pdfIn PDF document text
    • https://ewt.cz/res/file/tisale.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/kopetaw.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ad01ebee3---8311443241.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/cbf2832eda48c313f6471ce595f64442/35365566822.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/25e549f5799d6f346a7518b6be2c4a83/83360099330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pedagogia+do+oprimido+download+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_off0000cce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 10664 bytes
SHA-256: ec29d708724a746d3ff4fc8e7eac15170bd60999245bdef24f9ea6d37680939b
font_02_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 18692 bytes
SHA-256: 9f2971c61f0c262907c9bd2ae7ec40dedec22aa8863fc1de9ca1039ad2972b67

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