Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfb40e98b2294a0…

MALICIOUS

PDF

231.7 KB Created: 2021-07-06 13:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5f07ef7dda835ada155f93eb7325f43f SHA-1: 3a0fb87a5b24d9dedb24f7744e386cd8ef3a6a20 SHA-256: dbfb40e98b2294a0e1fb861efd91316e5c4e4a34fd8d91484e55461a2d351bb0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards the document being used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=harry+potter+crossover+twilight PDF link annotation
    • https://fairtradeportal.pl/userfiles/file/47818554364.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/87746031187.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1fc165067---jivalufowegop.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/paseniruniwodixep.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/delijakuxef.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/bb1fe931ced9c62eb236acaf831f3bbd/xepavekawalijujekugox.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3f0c7aac207a22837201b470d7c53da9/88708525321.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/cedf7233dcdda26bc9c72bef48cda3c8/59775866137.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/79083760969.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42444756d5---pofaloj.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/1ac3ffb42061ddc1b94b285b702dbb62/85188095899.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1cde5012e---bedajozobebiroregoresi.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/8996290806.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c85ef6987a1---9694177852.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47070d849---58173772407.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076215fc17ec---60703191231.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/99623498857.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/19244771416.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/32f5fb5f759714369b54bf6b20c903e9/76453755836.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f2d7a9a747fb4f6f2cb8859e3af7c896/nepejajo.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071d2ba47ce0---sisexijusen.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ef2f939d0cb80c06f3d3980d20aa53d5/72492963352.pdfIn PDF document text
    • 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_off00032fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32FD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000347ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x347ED 10808 bytes
SHA-256: 1c61b510240d3a379ce473416bb5b9b4ec40189bb93cd65ad7c24f753c760b26
font_02_sfnt_off00036104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36104 18208 bytes
SHA-256: 1a551af251b037f4b8d6dc64496b3d74646d5f16574a9b005f7ee4f560694375