Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb2fb2146083772…

MALICIOUS

PDF

98.1 KB Created: 2021-08-09 18:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: faaa2b6fe8202c548d6c222caad4ecc3 SHA-1: 5e27f0cb0da24f10df88ec9d9a3514130df76510 SHA-256: 3bb2fb2146083772d04851b60d6ac06e1fa940e995f6a659b93841db69572bb2
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/9hke4n38rabbt8tncmbpmvhng1/tegovasirugasiridoredo.pdf In PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/5b67c8238249424d0fc67f554095b8e3/4358383937.pdfIn PDF document text
    • https://ultralloy.net/upload/files/15029659453.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/mewudajobanokixofez.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gusowefu.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f3ce59fb05f8f0a7a7f58c4c5da20f58/gekenud.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb2f255c56---19542260567.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16079d6862266d---35244531822.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3b80d6527adb5cd391381f4e00d683c9/29235194320.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/52899987214.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/18466477982.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vavusowanafutolijaxixa.pdfIn PDF document text
    • http://4bx.pl/public/file/86175315827.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/71516454110.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/ae5pa8fkmpcrqhtef5lo6hlee5/86533553729.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160749a4c28087---jidida.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/648fbbbafc6d622e8d2ef81fa9fb1952/tifosizupomu.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/nafowigonenamet.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098b36321dd9---31709784197.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/941596395c1d08aed54adf07692bbe74/bilaxoke.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/46133161d837ed4e1dfa1811a6b37f84/17584019104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ejercicios+resueltos+de+vigas+estaticamente+indeterminadasPDF 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_off000114ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 19504 bytes
SHA-256: b2e5d7c92929cd77cdeefba10ca1124771a2387e5fe2364ffbab2cb7600e813d
font_01_sfnt_off00014695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14695 10992 bytes
SHA-256: 047186138bd2bdd5fc2b015eb43eb2acc3c4c530f6c46b5c77d2d4812d1d3ca0
font_02_sfnt_off00015fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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