Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8877536f205e84…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 00:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b0c927e670573c736601db36f426463 SHA-1: 68b734f7a5bf3565a4924dcde6294b831765a8b1 SHA-256: 8c8877536f205e847d4bfd442618abbcbfa569f944152647fc39fae33de4151a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://freetds.net/userfiles/file/vadex.pdf In PDF document text
    • https://bearings.vn/images/ckeditor/files/guxanumalosumolegav.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/dibikeburufo.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/g0c27loqc581cedcelbpibvsb1/92203024481.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4e50c511---muwepuzewol.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/25964064786.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9d87d55f76cb2d1254e8da3449a35186/39045774497.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/39485181021.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/xavekatazukosu.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/46908797041.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0ab875b7---94385716089.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/rezamewe.pdfIn PDF document text
    • http://royalgroup.at/tmp/43402287798.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/palet.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/66017552277.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/sepazejexejibazakune.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/13915807732.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/20657013651.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/tibawapodidi.pdfIn PDF document text
    • http://metabolit.ru/files/file/68331404453.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202194556104434.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/55389111719.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/gefudabelatipegi.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/parenajosukopurewer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+a+video+a+wallpaper+iphonePDF 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_off0000db50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB50 17280 bytes
SHA-256: 6613b4392de33aa4666d60704d890e3b3229a8116496802a6628cef92906da5f
font_01_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 10724 bytes
SHA-256: 280542307486b65cc910a1531ecd809fb0381d2794954f8fec4f3148168283d8
font_02_sfnt_off00012063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1