Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d51d591f332adbe…

MALICIOUS

PDF

103.7 KB Created: 2021-07-07 21:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ea6597d29b7beb79b517351c48ee20f0 SHA-1: 943a97c7a1a57edf9a6e47697103d1c62418ff26 SHA-256: 9d51d591f332adbec6f8492a3d4cec4cd006ce6b1d1d8f08c607d64d381175ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lead users to further compromised content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/87e4475c78e7d6873dcdce06331401e9/42909020700.pdf In PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/94kepk8qhdppjtse6t6f79dgl1/96796343462.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609430f5d1dfd---mimediwutabud.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6349ea8b---jujawipu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8e481c63b---dizutowimumikupevuw.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082de352b229---5227084943.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c965d8ddd5---gunavogawe.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/buwazilobowizema.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/48301522493.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/52831960253.pdfIn PDF document text
    • http://fygl.net/uploads/file/201343421788.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160782994722a9---jodojawet.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/4riico2kc2dbe60o8mevfq31g1/tusigudezalaxasota.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c98420acc3---kiguraruzagilo.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/93866148017.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b67ff1649152a69dd85c66df5fea9af0/97475739540.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/imre2f4m3je8si7sikrv9qsui1/80652944364.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/90f14ebdebae1f0f101a8ca01f104188/patagigobovozuwa.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/6bkemdv6rnri46df9q7efelboh/17260054391.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/sufopezuxonago.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2cf7901a1---fozafozux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=married+to+chris+martinPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12712 2288 bytes
SHA-256: 8f35e4e40e0dc0c7aab6256762aaa69538f555f1fb7b968fc91c38ed7a8fec0e
font_01_sfnt_off0001314c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314C 10580 bytes
SHA-256: 3b482bcd2258f6b8e57e87b76ab22d283600b1c3ba3210b1b49e3efb76bcc759
font_02_sfnt_off00014941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16153 18492 bytes
SHA-256: 5cec442bfa66d5a2534d93fa6114bb8982f0160fb3aac6b6b84c1533b9be18d9

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