Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba585ddc488fb52…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 01:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1d6624c8c91a81a6524d6a14308f4929 SHA-1: 136964264121e92461f12105c87332cdc751c355 SHA-256: aba585ddc488fb526f57c70b1b7a53ff96a76577c9b280ad2a8fcde7b9834336
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple unknown URLs hosted on various domains reinforces the suspicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e456b6cb11---90937451223.pdf In PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130a5970120a---24666217552.pdfIn PDF document text
    • https://almavilag.hu/files/files/laziwonazefedijetopexege.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/7613515069.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/22254844310.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/70654123043.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/sifupesijenu.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/tuzajotefuzuledenavoj.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400a57b5735---74721274188.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/257333022.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/96833104548.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/pusupafizafuwiloboge.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/21354984958.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/wegatunap.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/53061202970.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1614532ce3e425---gibaxorawidubixis.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/58933396839.pdfIn PDF document text
    • https://ivanamihic.com/files/45721881646.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/bidamejesuze.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614517036bd1c---nupududemexuna.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/89594050025.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/15585192314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pembuatan+program+androidPDF 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_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 17808 bytes
SHA-256: cc48af2068a2df0a4b30159ac6a745f62523fa70f40415c301d4f9eb5f0ee1ba
font_01_sfnt_off00010f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8F 10764 bytes
SHA-256: dbec281377caf9c0e22d75cab02bfce7067606f41e17566d451c07d246f1deab
font_02_sfnt_off000127d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1