Malicious PDF — malware analysis report

Static analysis result for SHA-256 99aae6f090eb9b46…

MALICIOUS

PDF

76.0 KB Created: 2021-09-21 07:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b974f58aa60c16e52da73569e359f1e SHA-1: e5a1321016ecb5ebb36b0ebf03f373e954caba57 SHA-256: 99aae6f090eb9b46771bc7b5e68047fc75a73efa7297ed88799983c01617bd0a
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. The presence of numerous external links, many hosted on compromised WordPress sites, and the specific 'Payment redirection / bank-detail change lure' heuristic strongly indicate a phishing or business email compromise attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://huntic.ru/uplcv?utm_term=t+mobile+unable+to+receive+text+messages PDF link annotation
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b4607e3e2---47844346389.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff95f79506---lusezaniga.pdfIn PDF document text
    • https://pokereshop.cz/data/file/bukiwule.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16131b70605c9c---pigutanapisatakeferinif.pdfIn PDF document text
    • http://punaide.com/userfiles/files/24616760067.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/pevututofojupo.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/99917869890.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/todopekesobakotojibosisan.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/42823586158.pdfIn PDF document text
    • http://futboltotal.net/images/files/46853226357.pdfIn PDF document text
    • http://kco.su/userfiles/file/50872889264.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/sikurasixopivixires.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/dexejevezununazaxokedu.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/jepukaka.pdfIn PDF document text
    • http://cochemical.com/upload/files/monafisekulovitagogixila.pdfIn PDF document text
    • https://parkettworld.com/upload/files/kudejumig.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/49773676030.pdfIn PDF document text
    • https://satesayap.com/contents/files/repemukokazixetuvit.pdfIn PDF document text
    • https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/91028141663.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/wodesejotovoneraxesop.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/91973746466.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/160121057549.pdfIn PDF document text
    • http://pmke.cz/pictures/files/83774783498.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_off0000c518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC518 10944 bytes
SHA-256: d37544ba5a977cd6c9c5f028889ecac7a37207e3f79ea5cc4205640e61f0d8cc
font_01_sfnt_off0000de79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 16808 bytes
SHA-256: c81522f3beb21c5afbf96cb2828b314b7309c80298f3e7290708df87a9baf23d
font_02_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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