Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d4330c79c55613…

MALICIOUS

PDF

110.6 KB Created: 2021-08-02 15:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79b1a4d89c1a0189837b983812cd6365 SHA-1: 30d0de8daa168f6b2bae33cdbb313443440ef770 SHA-256: d6d4330c79c556135d06f0fe23c0438e3004f2ac78d9534acf963d49cd500388
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to potentially malicious sites, with a specific lure related to payment redirection. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the document's structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://candientushinko.com/images/file/jediv.pdf In PDF document text
    • http://pho32shabu.com/uploads/files/11319263680.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/dcf9594aa8460327f711a65360f5223a/36031435993.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/79980804346.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/bd9186aef413a9ee2e8a18f43e1346ff/57276371390.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070806781340---gixiwiburirujuromurux.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16273808171697535678.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e69e98c34---25488914041.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210613193224118.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/gowadovatasolufolojuvab.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078819c9cd08---mugudugigepatet.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf0bf521f6---dorukobebukekotajam.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bc39966c9---96055584639.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/xopuref.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f01eb787cb---repatilugafuxam.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/uul23cfrp8pneogh18eppkf981/raponasaledozaroxotatata.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/rewozipupan.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/fegeramawizuzalube.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/senivotuxamodamojoxitis.pdfIn PDF document text
    • http://tylerdaynursery.org/clients/8/8e/8ed7c4ff1d995b028c1180c1bccb3f4a/File/94532259184.pdfIn PDF document text
    • https://kenadong.com/contents//files/tolubaganibodalaki.pdfIn PDF document text
    • http://cloverdiamond.com/file/nogiwaberodafu.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/zerekosomitil.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/20737896756.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/mekazalefazusovak.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/99933354007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=give+me+liberty+chapter+13PDF 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_off00014c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C10 17096 bytes
SHA-256: ed4443cae651858a34d101509c6a4faf9c07ba26cd3a9352ca71db31338b141d
font_01_sfnt_off000178e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000190fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190FA 10832 bytes
SHA-256: c830a3fc8d0974258fadc3779caae727ef1cce471733d6d4f8639749a9d47658