Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7d6e6c4474866a…

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 18:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c0894eb7dd223fdf9c8410911a300477 SHA-1: 2f043cf5c9b4097a153cc2343653930adf10a14e SHA-256: be7d6e6c4474866a8273eaaa009a2713e85218eb440a470ca28045436b6a7a1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=spinach+and+pumpkin+cannelloni PDF link annotation
    • http://asesorgubernamental.com/images/file/jarufutob.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/38559541634.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/016fc64de377a7cb33555d6770917938/9681201892.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/82r63k423tlv6s5vnvlhnaig0c/jemagofad.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429005310758064.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/puzafatarese.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/rpc6ut9sqkcqjrdtatjjs671eo/23517142424.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90d397749d---87022893742.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0597fad16e---10839591380.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63da42b9f7---96775755300.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ba7ccf359---wosan.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/45164812979.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/65ba8e11c9f88ad1bd45092a6b2ee96a/mipifoxuwuxuluvifi.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/damorejowubisurawole.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9c0b62891---27787495445.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/58670594906.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a6b29fda00db99a01096a40b53545861/14832562044.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160960dcf1c19c---17819707282.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/20m7olhbbc282fu8n9s8ne43fl/78342330488.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/70441042314.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/fosisatusawimagomiwu.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/c3bd9fb3ab3e583765264a4e334487bc/maburezakiligasamovolu.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/74791778973.pdfIn PDF document text
    • http://apcmagon.com/userfiles/fowafijel.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/lunaturetiwaf.pdfIn PDF document text
    • 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_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 17736 bytes
SHA-256: 349769d17286412fcde5d4c61851157e481753c4fec92e13e1b622145b9f9e66
font_01_sfnt_off0001205b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13872 10680 bytes
SHA-256: 8a110ecca1d77b40323a67a2c0f5716e328aa9793e25cf9b47b9c6383d6c77e5