Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa14c0e2ea2c816…

MALICIOUS

PDF

93.4 KB Created: 2021-09-11 00:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: e879a28a01a91c9420e88a3900019d53 SHA-1: 003bc6b63675f077d9c65cb9a84929d78455ac39 SHA-256: 6fa14c0e2ea2c816865c84769b456cb32be2cc56fbd6682f5049322194e2d712
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://turnwealthy.com/ckfinder/userfiles/files/53779423991.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/lotjrtp2riq40v5auieqsosjh1/mowimul.pdfIn PDF document text
    • http://vhshf.de/File/97934881854.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/59300772034.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e685c02f6---84773260128.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ede604ee38---90960306546.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/93807203625.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/soleb.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/28686844274.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/59908414677.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/92rvfpokcroresqno1i5l2dnkd/95188500066.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/88615440935.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/29596151725.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/dufile.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/37155123302.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/xarukizavotijopumabagoget.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/vaxatafetutanuvefijulugop.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/vogilotikovuwoka.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdb7d22f83---83553807991.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/lamabukagukoparev.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/11001499159.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613331b90a762---18091277194.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/webusifopemilobelosupilo.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/34447261767.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/60436654947.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///zelujijenawikilivitam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=interpreting+quadratic+graphsPDF 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_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 10824 bytes
SHA-256: 6894bbcfaf4beb4b607a93fec90f3f6b9ce7a83fec2dea286fdf2b1a521b84bf
font_02_sfnt_off0001385c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385C 18332 bytes
SHA-256: 17d7e6bcb15785cf26ed1740999b84f647e4036689717b784c8d9e6bfff49ddf