Malicious PDF — malware analysis report

Static analysis result for SHA-256 2701d4c04c951f78…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 18:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4a628bb7a648e4d2d84d3371ba8955d4 SHA-1: 8d12eff5eb1998345826e0a0de91e3659bf15c9e SHA-256: 2701d4c04c951f78328667488795a8d90f40edb0787f11f5cbdd589e4b747a89
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. These links likely serve as a lure to redirect users to phishing sites or download further malicious content.

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 http://webinaris.eu/ckfinder/userfiles/publics/files/lozavobuno.pdf In PDF document text
    • https://istanajp2.com/contents//files/demofadelageb.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/52340709521.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161113ede588b6---zunodekokekomaso.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c3ad14cdcf---44624097541.pdfIn PDF document text
    • https://cargotavio.ru/files/file/55934578960.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf5918248---69701450981.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/70a1182f9ef209d26498c9c39eb720a4/volakewigejagumuso.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/10162372604.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/misusakateriwufubej.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/56863809296.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/52200995187.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-3/20210903094340685053.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/zatezawuzaginuwuruzaxunur.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb7c77728e---90200273306.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/nevobawug.pdfIn PDF document text
    • http://nprofit.hk/userfiles/61736370534.pdfIn PDF document text
    • http://fpole.ru/sadm_files/pemososizesufipo.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f71a7e46c---60385060726.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/60036887807.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/44481031679.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/jufoxotigifinowepap.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vodagofor.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/87298316484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=spdf+notation+definitionPDF 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_off0000de85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 10252 bytes
SHA-256: 0e84b2149d9da6c8d79d7e08314e8a7502051b96dca6a9738215474789a94160
font_02_sfnt_off00010dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 16556 bytes
SHA-256: cdf358d0ad89b92bc45e43434102b63e3c47a7cff77eb621b3b6c55dfa5ed540