Malicious PDF — malware analysis report

Static analysis result for SHA-256 db508f0f8f3465c8…

MALICIOUS

PDF

69.3 KB Created: 2021-09-05 19:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 196a4f2d9827987ea9df590efc8ce76e SHA-1: 82019f64e65095657ba93b8263e82c72a543b108 SHA-256: db508f0f8f3465c813d7246acb1266b06e9be2b9932617f101d5ce44a38cf5af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7319

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
  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://di-tech.kr/fckeditor/userfiles/file/gavoxixijejisulumudil.pdf In PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2ae97fbc0---65341764117.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/82043564804.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/67982548902.pdfIn PDF document text
    • http://lurome7071.com/clients/e/ec/ec9741bbacd2a64db66b94b03f3cd24d/File/55640022349.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/petesifojedarigadom.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc4009e57---69934907540.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e503f2700f---2365288465.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ee5e234a9---kebovurukarodanop.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160894dc4e3b3f---26158945021.pdfIn PDF document text
    • http://atek-ent.com/upload/file/wunozu.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a69b3b61549b4f76d36f731222bfd81/sodazef.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/40620139468.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/7r0i1hl9378dt9lota4dqvlet7/35497597512.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/941e2ea0b7a9400f91739bd5652617ab/58041171024.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/50848089354.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/pemuwoxo.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bgjc9rr7he7dsfgg6kvgj4c5tl/taxofewogumaxevagurixo.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/aq527vanphp3bdb2471dqu32q7/18036771031.pdfIn PDF document text
    • https://webhosting4.net/media/file/sepimobaked.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/86602155381.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/65084266135.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b831409681---sumefinusirixenanogawige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pdf+to+printer+file+not+foundPDF link annotation
    • 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_off0000bc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC23 15896 bytes
SHA-256: 3f48bba96234534a506c5bf4340f05a4c64dd4183d7d36cb2427d9d64dbf8254
font_01_sfnt_off0000e498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE498 10264 bytes
SHA-256: 644d7c15ae429bd9293ec40743e3531bdbd67dc89de8b6d2b5c7ad3a147810e2
font_02_sfnt_off0000fbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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