Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7dcca49615189c5…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 00:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8f6b03e70c2ecfa7bedd31ea610119dd SHA-1: 30bd0fc4642efa77f917b5e2261f1bd76b85c7d8 SHA-256: f7dcca49615189c57793a79ab920f65118bdf415a3f10859af55d0a67426b69b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The file was detected as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2781

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
  • 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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7threjh4g6lg7hr5cb25ife5o3/37067503926.pdf In PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/60995273280.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609641e5cd41b---wamerupobab.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ae37bf7e9b6---70096723200.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16077d32b47929---16994967500.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/siduxifav.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/37026089607.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/giwuruvunutovusuvab.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/zukexininu.pdfIn PDF document text
    • http://lg-palette.com/upload/files/64171154426.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82417430694.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/mojusozugutibulito.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abb249a70e4---satijelojupojegazorit.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ee5cd2aec725f1fed3220831aa74e773/39549933376.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/judureri.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/4620109835.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4eeb322da---86686573363.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f80f2a7ce---pajeponiwulofatu.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/kukotanizigasaxazo.pdfIn PDF document text
    • http://crm333.com/documentos/file/bidori.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/41218cfcdbd000fff482a596237bf76b/jipasuvozorepekubaborone.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/0dfvluh62ppeopucndlfem2g12/fipor.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/89033033845.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/24435579861.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/tuneke.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/defuvimajitejowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=free+french+books+for+beginners+pdfPDF 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_off0000dd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 17760 bytes
SHA-256: 8a41ddc8d0aedc4c96e39857653bacfa42522337a3bfa8add0f7360464bbc9c4
font_02_sfnt_off000122cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CB 10800 bytes
SHA-256: b254a7ea9ad0943202aca213b6657b667a8a8dbe919b7185dee3675b15806208