Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72b11ff78e8cb13…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 10:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 534db36dd4d3c505851cc0202ea38abf SHA-1: a78034d9d1c2c22242dfff7b3fcaa77e36793032 SHA-256: d72b11ff78e8cb13da3a99eb50463713abd1a7bca332cc932cc8d631214f0420
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Access Token

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or credential harvesting lure. The heuristic 'SE_MFA_LURE' indicates the document is designed to trick users into providing one-time codes or MFA approvals, consistent with stealing session tokens. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used to distribute the phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/tolitususasigerofakupa.pdf In PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1e8931cfb---17198892572.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/27931712433.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/farunikafigalexi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b216248a515---pokes.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/jowigeviwoparagoled.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/bpr767psrc6h6qihlgps8rkqg4/fidavegugov.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd15a3a78b---71969667700.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/nofal.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/kepaxopezaf.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bd34da6d0c6---3481009934.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/52698235603.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/60551892964.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/n0ldgsmd3rksqt5tbio8k6hbbg/36966697590.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc1754e39---gezisi.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/73bb84034e8bd1545778c413784f0fbc/topisabezesojegexi.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/14939442191.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/54837573186.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/66731157848.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/27282765460.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0b35a8cf3ac9937231b8b28ef1af7795/xisakakajalozejijazatopaz.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/41950424592.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612174ca6659f---lawurirav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=hik+connect+apk+manualPDF 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_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 10448 bytes
SHA-256: 5d2913cfadfcf03106b335d6255a0b3d87b6d56b03c465b5c9004be5e2aae3ed
font_01_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 17732 bytes
SHA-256: 35d5d949fd2b76eec2eb4de1b40310ab7b7722f1df9cffb579accd72cd32f7fb
font_02_sfnt_off000121d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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