Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda64427c442006b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 12:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e667d316d356162e7aea43855f0d5fb4 SHA-1: c37c2d28ec3f71d86e7cf731ba530fe8463edfde SHA-256: bda64427c442006bbffd60fbd02239648317822583ea83f7997820e87929efb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The file functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple compromised domains and link farms indicates a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://batikatravels.com/userfiles/file/lizukejazeme.pdf In PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/1001003813.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/280523169086.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/metrqiuqbo75ssora8co00au10/duxivegika.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/40551456447.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a36a58dea---98365420699.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/al05fhmath9p7i3fg55hcpuqp1/99713006423.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/29865331075.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/likusurumikivufomakopanew.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/67108592273.pdfIn PDF document text
    • http://ibb-online.ru/f/file/pufikulewik.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609629ebcbc5a---gajibaliwizozemipab.pdfIn PDF document text
    • http://poorclarescork.ie/images/88170025585.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/gabukolegu.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/fezasarepegasepipudon.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/50114483449.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/45f86518f264fc09c12302b800770ad8/77201503315.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/vizazodurik.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/29699457667.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/mudofizonegi.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/nogikenebupikebujizuzak.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c673d3359---86449904155.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/60084978315.pdfIn PDF document text
    • http://novafish.it/userfiles/files/90060474279.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/866729835.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/mabof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pengertian+hukum+secara+umum+pdfPDF 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_off0000d8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A3 11092 bytes
SHA-256: 28dd4ff7d3bd9e702a7872efd17afd9301cb7f15e554195b945e4fb0b9c6235f
font_01_sfnt_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A39 16092 bytes
SHA-256: 1bdad9e86a3f18503134f5c5e63011b657f740025f611f17b4f8d496c8a9578c

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