Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2177a9fc44372f4…

MALICIOUS

PDF

73.4 KB Created: 2021-10-06 15:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: dcebfe9d65b3b2acb9357c3d0f76b5a9 SHA-1: e3b48c7b3dbb65b649da6c58474f02db951836c6 SHA-256: c2177a9fc44372f439dac1342d5fc284e79917b64acca00f32fc2c1d23487c59
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains flagged as compromised or disposable, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or trojan payload. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious link distribution mechanism.

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 http://kammed.com/userfiles/file/99088477092.pdf In PDF document text
    • https://xn--psg-9lac.hu/files/files/37180649822.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/22970622222.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/49158871411.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139432f34592---33398192068.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/gumuki.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/1026185022.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/80444983097.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/nexaba.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///retimogewa.pdfIn PDF document text
    • http://hidramaco.com/files/files/5091168381.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/woxeroli.pdfIn PDF document text
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/fikekesidawibube.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/45895446096.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/94139544829.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614078124a24b---89049179967.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/xozojejagesewop.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/suzanegupopadetuwefidimo.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/93391694777.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/nuxanozajuturewupe.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/26864598365.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/20a01e162b40d5c1623a7dace1c81f9e/8106308744.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/fisozuribekosibuximaxofex.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/mavevujofobegevabinuguvek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sky+dragon+chinese+restaurantPDF 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_off0000b930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD142 17536 bytes
SHA-256: 57dff505c5b1867dc36d8efd9f1a7d06f4fab6fd9624b2f018158b8b56d12de4
font_02_sfnt_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 10984 bytes
SHA-256: d9ca4e72868383d1696f94ee85cb2c3b2c79b163a97bc4f36ef51ee626118d9a