Malicious PDF — malware analysis report

Static analysis result for SHA-256 729c1e6971b04587…

MALICIOUS

PDF

95.6 KB Created: 2021-07-01 16:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1edaf2c21f3984495e95da4781da7f93 SHA-1: 50f0a393c040b582b5788184f00559f61dda04d4 SHA-256: 729c1e6971b04587e5d60924ca96a3270443528736b5adc672057f1f9c68575e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/lcefac90blvv8k2125niup3prp/daduxivesekirononif.pdf In PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/toblhnnd3kit6lrgrqned7t0td/43579923376.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8292855dd---piwakikapupupu.pdfIn PDF document text
    • http://charivne.info/images/file/38913337924.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f6c5115c0---parijaloje.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/gojafewugiwawo.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/bk67phh5vss1dc9v8385on9skl/54044640905.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c19fbe4bbc0---goxukerinusexarek.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/wunekobubokatidanunezuse.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/dafozotogujosojewasop.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/48c3d3236dbaac38f887f68a42e8276b/16242089823.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/sidali.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64b2aedd38---niladafepilige.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160929e6bde8bf---rafuxugovilululuz.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210630_A3C04ABB7B085A6F.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160775e787907f---notexuju.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/51f5a7028169ad62fc1221645dd543e6/wozifokodiwidokonekek.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/leweximebizimozinumo.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078453d6a47e---vuzozulopimoxejamije.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d4c9977731d420616a09b0a2480b3a7f/lagalepajusilepazikosa.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/majixabasaganixepupe.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/uib7poekvrgrgvp48hq8cpe7vd/vupabubatoresox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=large+lateral+malleolusPDF 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_off00011795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11795 10312 bytes
SHA-256: a5be06e5cec8008a479e230930adcc73ce699466776feddb93b6a66c340a21da
font_01_sfnt_off00012eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FD 16512 bytes
SHA-256: 11898e6f99b73c7e36ffc5ad122868eb02be7d865c5f7c0dd3cad0b143ff6888