Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4dc5f2c0140b8f…

MALICIOUS

PDF

77.0 KB Created: 2021-06-16 02:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4c6966375b7300264a351061d436ed75 SHA-1: d7fe397dc78ee713f105cd26e05af9f7f4e9e7ab SHA-256: 3f4dc5f2c0140b8ff588e8222be056b16761e495008d78d922629a5156d887a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=chelidonium+majus+pdf PDF link annotation
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b113cdb3546a04d79746fda7399667e/49691407271.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/89599423390.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e09a4cd8e---rapegarano.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9955a4f5cdbd9db8ddd1eb49f7981226/virisujonakuba.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/148801953160a5bff5f3668.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/zewerazizupukuzemulujixu.pdfIn PDF document text
    • https://tmtteks.com/files/33705119890.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f72d74806---8364182141.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8f09a2393---zifer.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/96bbdf6bf8daaeaaf7e4644540fd7356/luganixirumunavubawoduk.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/54786271804.pdfIn PDF document text
    • http://aimic.com/userfiles/file/muvej.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/28744311761.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/fokifunowefotu.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/oue2nnju2m8h03qlbcmr3b769p/vegebexegu.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/q4hgpqvkg4sdp7egngkv83rp9d/54965960009.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 5168 bytes
SHA-256: 9e1f510e6aa3c78242b1c70d90aaa552f60b9b91989b19028f2a9e3147c9f8e9
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 12352 bytes
SHA-256: 6714136ac2bb74c79a6064086a6d6602237d764acffd2edd068f1c2a9d3954e1

Open this report in the interactive analyzer, or submit your own file for analysis.