Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c25c6b94c2cd62…

MALICIOUS

PDF

69.8 KB Created: 2021-09-10 23:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f54069b8431ce49b9a61b1feb324e5ba SHA-1: 332051095841e4bd4858e90977a9f040132862ab SHA-256: d6c25c6b94c2cd6229c3ce523bb4b32f7a3b767edc5967bb59a94734ce032ac4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://giaphutelecom.com/tctt/sites/aaa/file/66136545217.pdf In PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/91825573004.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/52929575838.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77677308971.pdfIn PDF document text
    • https://lapakunited.com/contents/files/zajepume.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/vusugaratugelopome.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134f4dc8482a---73528078465.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109041825109444.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/49112544702.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/tuwodezumapi.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/59935303673.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/zopagebix.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/99212293016.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/2022305373.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/91297178146.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b0312cbdc---duromu.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/44689932081.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/nipezomo.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/metebaworitulifunon.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161380afbf413c---moboberut.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/kikixa.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210909_6F051E73D4E6FA0E.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+see+someone%27s+ig+even+if+it%27s+privatePDF 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_off0000b2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB02 10832 bytes
SHA-256: 6dbb7f4e7ed9b78ea85e8734b9ffd0c097f181a9287935d5a782de9e2df2ef8f
font_02_sfnt_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 14732 bytes
SHA-256: 90271f36ad19add4325785e4d667baf0ed8c66b47f08c9f2be76c142e9d93ebf