Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bfaf2281563bc0…

MALICIOUS

PDF

101.2 KB Created: 2021-06-28 13:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 15465ee35759315125c88ae01834f7f6 SHA-1: f16192202f27a386226c3543b10e28cf54aa6deb SHA-256: 41bfaf2281563bc0996fbc1a3a785e390ccd77d9b52738ebd6bd5c9fbd26d55a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external URIs and is flagged as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d785125a85117c363b67fb836e735c3b/seriwobato.pdf In PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/421cb75a4ec7c0fc168d2290f4108ff0/garabusuruvixuwem.pdfIn PDF document text
    • http://kfbi.ru/content/file/75047545909.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/dq0eogngobe8cah30g50mof2r4/44562002274.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73cdd946c0---mitofamaxika.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdc5c3a3f2---tunezubi.pdfIn PDF document text
    • https://anfauglir.com/images/file/gafokofexatenesijaxidav.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dcc880fdf---9132347186.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fobagelokepagumijopuzax.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703fc3d0097---xomewep.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/75660894278.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160829d38493ea---96819432277.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098dd8b32bb6---xurozazomujo.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9505918aed62e6c54d89396a43491016/71126625052.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61e98bed27---xaxopo.pdfIn PDF document text
    • http://gdgom.com/upload/file/2106271956366821198o7sjjytvzgj.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7a21e1479---85723302037.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bef9dd67e44---magisifededopetalo.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609219d032249---bitazobetevijanogadap.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cf16f38f7---duwemar.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/aff3106636bebde3d643bd370be5ebbc/vizovufonajokizowotubijud.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/barekoximoloberemero.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/bexejalujetusod.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/bizifonuzemenivalipagobog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=part+time+administrative+jobsPDF 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_off000129c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C2 16740 bytes
SHA-256: 0cea9535cb40acf483ff51b699384ead20162135fcb1d08725e412e828fcde62
font_01_sfnt_off0001554c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1554C 10700 bytes
SHA-256: 8e0a1ab14db32cccc7c97e0bc8cb2cb0302f0072f8a1baf9334377f670fc59ed
font_02_sfnt_off00016dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1