Malicious PDF — malware analysis report

Static analysis result for SHA-256 5928e6c2221adcb4…

MALICIOUS

PDF

84.3 KB Created: 2021-06-26 01:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e7b33dbef1dbda5a6572ccb831ea3e74 SHA-1: b696248785f719270ce3e4126c902b7e25048671 SHA-256: 5928e6c2221adcb41adf40b645f269595ec00a54b1dec323881b6640809f3540
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/55o29rs6l6kor5mc5g5btsnvq0/mizagojogokadonupiw.pdf In PDF document text
    • http://obasekiestates.com/UserFiles/file/15690527131.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/uv8nruokllv4k26fh8i0gfjpmv/zurovevirotuvekuganader.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/25743383973.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/18558732479.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/luver.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6d4e87ff1---65492530767.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/seqjgl9npj3m3p7nrd3a2bkf1m/84675430764.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/jijudarivalom.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/ratigibavitazakajaji.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/ketagisaboto.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607deb43849fa---21171912957.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/0a22561f039ae092fd3c12d9763f6c6f/16052763188.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8892da653---47624811184.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d0879fd55f937c562f2387ab8f21727/13702352942.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/fcaf979de546c3e3cd13a5a8e7213786/vepudosa.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf9873cbf6---tipofi.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502165133829675.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/72519285371.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc93f45340---65957477646.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089c1087c51a---5701509037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=texas+sales+tax+certificate+formPDF 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_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 16872 bytes
SHA-256: 307bcf6780135bed14ad8055244257ac3facbd32d21f551791adad1311350652
font_01_sfnt_off00011441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11441 10456 bytes
SHA-256: 3b92b132cf0942448b2d96d6179ed16e98702738696312430a5cd3fd646906df
font_02_sfnt_off00012c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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