Malicious PDF — malware analysis report

Static analysis result for SHA-256 2031f00bc87f5df4…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 09:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 29cfb5b5756c005a5ef5f2910a7cc5e2 SHA-1: fab6ad7e19c3bc7afe58f543ee67cffd05e55b92 SHA-256: 2031f00bc87f5df4500c3e60e50e22bebf239dbe25039590ac9e1ae616a49a1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF sample was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://aksaaydinlatma.com/img/editor/image/file/94768943343.pdf In PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ehndgamb36spq7fvc0f2ld5mai/fidoxirobemusufefidujewix.pdfIn PDF document text
    • http://dentherapia.hu/files/file/rexelajopoxenivotetogo.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/38a3e3f53ee57535c9285cac77dc02ea/66182541627.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca2e5bf3c1---82901770995.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160962de2c1b74---fifumota.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/qtf3b7jrt1ku29b1um5luc9hhs/zuzuxela.pdfIn PDF document text
    • http://maksimetall.ru/files/burodisudedemefim.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/30599402197.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/83476742300.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/fugobiseximifaterojop.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/168bdf96572db6e92a5c957d15721495/vinufutujufirilexorutute.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/revimukonibamejik.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/3f7b8fd94601f22d79ce70e0ebb97e37/megozipevasimebosulofif.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9cd9e737d---pavaguvoli.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/795372419e14e6e386f6d1552f8e2e72/65575493570.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/u6f5qvn3o9a6prb9bgoqe1lnj0/12754927656.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/rh5ruhadp99639bj5bn9ja57u1/dimaxoke.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/tajosuxolo.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8985035c1---29660491565.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/lotejafiri.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a9426bc6578---lulinegotidepabudoj.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/40955416315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=posterior+belly+of+digastricPDF 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_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 20224 bytes
SHA-256: 65c99537c3854411f9c1640b8010b6906c3f7187048a87d705faf7cd8c445784
font_01_sfnt_off00011441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C58 10800 bytes
SHA-256: bf9943fce6f3fd197f6489aec1be5cfcc1682c1918fda714a69a2635d093d62e