Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f68085e54e71e4…

MALICIOUS

PDF

69.9 KB Created: 2021-09-14 13:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b14d2e4625ea083060776673b2ce403 SHA-1: e9f27d3a7eceb1930a49baf7af6cae1c01b56547 SHA-256: d6f68085e54e71e40375dae25852b2d6a6fcbf49de957051b6732a20ac046724
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to external sites hosted on compromised CMS platforms, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://audiohrestomatiya.ru/content/file/jafifop.pdf
    • http://dopuskvsro.ru/UserFiles/junivulo.pdf
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/kevizipo.pdf
    • https://beautydent.hu/editor_up/luvixidevepuve.pdf
    • http://www.sandipmallick.com/fckimages/file/91262158242.pdf
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/36447096969.pdf
    • http://abwferrellpkwy.com/uploads/files/samewuzavatogiruwija.pdf
    • https://ecoquimica.cl/dinamicos/uploads/file/17144533478.pdf
    • http://akcjonariusz.com/UserFiles/file/99080539496.pdf
    • http://j1medical.com/uploaded/file/98533702624.pdf
    • https://lombardpruszkow.pl/local/userfiles/file/kovedigotoxolani.pdf
    • http://uco-kampen.com/media/files/visurukavevobezuwo.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161395bc98caed---fevupiweseb.pdf
    • http://topmebli.com/content/xuploadimages/file/97806122212.pdf
    • http://theorientgarden.iorderfoods.com/uploads/files/15914797999.pdf
    • http://www.itidharamshala.in/images/uploads/files/xituziniwewusup.pdf
    • https://fobh.net/userfiles/files/tisurafevupi.pdf
    • http://letresorellebio.it/userfiles/files/sobixi.pdf
    • http://salman-is.com/userfiles/file/20106661823.pdf
    • http://zbirozskepodzamci.cz/userfiles/jimisokimofadoregakoma.pdf
    • https://loyalangkorapartment.com/userfiles/file/83865925491.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/02541ef094cdcde52128e921e9f0fb1e/sedivelifimi.pdf
    • http://optometrystaprzemysl.pl/userfiles/file/79599078206.pdf
    • https://tresonance.org/uploadfiles/54737398378.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161395ba5b4692---kinakafibu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+cast+mobile+to+desktop+windows+10
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b293.bin
7d2a3c50ca742f6cdf3ea488cd0f9557015c93c9a9ef13e0c882d7916758acfc
pdf-font-stream PDF embedded font (sfnt) at offset 0xB293 11060 bytes
font_01_sfnt_off0000cc23.bin
eb9354576bd680b6d58ba4c26b4e56b243edd5607376a0607750de73759b8cc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC23 14876 bytes
font_02_sfnt_off0000f1af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 16792 bytes