Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccff12bfc2d28751…

MALICIOUS

PDF

85.0 KB Created: 2021-07-07 01:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 209902b3392a7f44cb8cb96fba851c49 SHA-1: ca0b14ec1075eaa6e58506bc65f3ba8316d7d1cb SHA-256: ccff12bfc2d28751693587409632bbf49fbe9f1bfb70d35800279edee45412e9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with several pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this, indicating the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=ten+month+old+baby+food+chart PDF link annotation
    • https://xanbiente.de/userfiles/file/71717453125.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/tojamusafa.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bcb023ba5---19419007038.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/dutulalavizujipubesizizi.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f6fc73e459933e51f00b066fc367a303/97072268266.pdfIn PDF document text
    • http://farmina.ru/uploads/files/kemigixekuzutin.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ui84ner5vib272lq5887cr1ij4/57636291203.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/89745776566.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/52504003007.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/39491371201.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098231e39280---24307582024.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/1997159954.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/mikoze.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/59699313966.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d64aaa04b0d27e669fad9b8cfb7dffd7/dozude.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/62179399017.pdfIn PDF document text
    • http://garderoba.sk/images/_file/58986180101.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/xemukama.pdfIn PDF document text
    • http://goldmustang.com/files/files/widawa.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/jobabadafedujepekizeju.pdfIn PDF document text
    • http://zae.me/datafiles/file/datiwovavig.pdfIn PDF document text
    • http://iphysiology.ru/upload/9466888911.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/sadixuvaxuxebedi.pdfIn PDF document text
    • http://fedime.org/imagenes/13016934723.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_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 10696 bytes
SHA-256: a0c9d3bedbea84497ada1701cc8bd7821a8d48cd06474aa7b217678ea2cc66ee
font_01_sfnt_off00010364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 16772 bytes
SHA-256: bd0ee7924c46075e285dc97cfc9890a34172b7eba6e544a3554ae9011d887bf2
font_02_sfnt_off00012eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1