Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c6d4f7f6eae32a…

MALICIOUS

PDF

76.1 KB Created: 2021-09-09 23:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f36da46e765b4610e8668f7ad92fa78d SHA-1: 8753565748b4c11fb69e09943012c64faddecace SHA-256: d3c6d4f7f6eae32a24c7dc71163ccb247cecebd1c680a9b7d3fe2a2560edcb44
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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 http://bumsnab.ru/uploads/files/75241640158.pdf In PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133c132c18aa---13236164732.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/30823847501.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/5425978027.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/digofinegik.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/84216780799.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/wetas.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210901220056.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/neduwejepupitalevalaresek.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136653c8982c---mutikitolezamepepuruzet.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/rilovawijix.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/2965683546.pdfIn PDF document text
    • http://freetds.net/userfiles/file/28294460921.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3664292354.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/gefivusixelulu.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109050227026991.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/vusuno.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/8ifa12geglpoia8dl32i6igc81/dimekeni.pdfIn PDF document text
    • http://1carl.com/userfiles/file/dejenobupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+hack+gardenscapes+2021PDF 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_off0000c054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC054 18660 bytes
SHA-256: d9efee19821d19b95961fc088d16aa5e1c34615192cdfa13c799286f20323a47
font_01_sfnt_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 11120 bytes
SHA-256: d5a389a4e5d2990b29f454cdece7c89eb45a672472e85fc4926d3a39afd2bcd5