Malicious PDF — malware analysis report

Static analysis result for SHA-256 483c5efc8ec30a47…

MALICIOUS

PDF

73.9 KB Created: 2021-09-01 12:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c63698329ac035704b9be9d0c470d0c SHA-1: e450dfae07374d96dc5491fa0feaff6fba507e04 SHA-256: 483c5efc8ec30a47605caa6763220361efeb775f45664e230f87d81c2d847f7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to manipulate search engine results or distribute content through less reputable means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c361be6f4f---64558534082.pdf In PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/gimisukejikipopa.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c9fa6a3bde321c49a4314b608880b7ce/retodidotobijozek.pdfIn PDF document text
    • http://silver1979.com/upload/file/kagatonadagepi.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16116935b90896---bazatobilaganobumuziv.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d941bf6e89c---nabikukuropexijimotalik.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/33414458850.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/45134564621.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/4oo9eeh9fe2e4g11t041eckr91/wijufar.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/15803228317.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/nuwusokoxija.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/fuwozaj.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c8ae4e2a17395aa3da2c65c2d6c4a306/25620918137.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210512103711.pdfIn PDF document text
    • http://kelvista.lt/images/files/93036911900.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/banipadolafinevupewido.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5284d4508bdf72ca7605174e7960c82f/ximokez.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/77632793866.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c91fce7c253---zageta.pdfIn PDF document text
    • http://spakimthi.com/upload/files/nuxivakoraren.pdfIn PDF document text
    • https://limsurempat.com/contents//files/19842604539.pdfIn PDF document text
    • http://iucecb.com/files/file/86976358762.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/pu7ntdnm62mmo9218i8uhtgh2c/47435906901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=why+does+an+animal+cell+not+have+a+cell+wallPDF 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_off0000c1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 10796 bytes
SHA-256: 05fa8b24208a8d9bb3c8db7f4ef38afd496c5659b580aaaf2730914db212f998
font_02_sfnt_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 15168 bytes
SHA-256: 7d6634a8c963962d5ed112922fb75ebf9c39dbb35c818f26a98fb49abbcd375b

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