Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d73cd11d3f3fe2…

MALICIOUS

PDF

76.3 KB Created: 2021-08-15 11:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a37ef2ca55e009622b6d51390baeff7 SHA-1: bda7498a90374b5e8007e8cb0b8275b05051daa5 SHA-256: 36d73cd11d3f3fe26e3a0143879a9a081420ef1e5c77971236aa3779cb25a10f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. 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 0.9987

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 http://karthikeyanjayaram.com/userfiles/file/wigawagiwutasipusogoza.pdf In PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/46712806815.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/88130812435.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/29094227747.pdfIn PDF document text
    • http://ecole.ru/text/images/file/29935080047.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/88283261287.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16110065763771---gidupanewumoxozulugelil.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814f8092fb5---27461970625.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeaae2bde2---73788662528.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/18523523234.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/bovopepovitijusanavunag.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210627092820.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/nixobogebos.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/88582662143.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b2c5d47351750034eb3c00c52201b021/nujufujoruwinojab.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/89821129497.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/0e254687e3c7fa209178540802f54b09/vixunesodefudu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e6078a929bb---vuganovefozagusiditiweper.pdfIn PDF document text
    • https://harom.ro/files/file/15645200912.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210804_4DB66F5E01754D55.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021073118361662.pdfIn PDF document text
    • https://btegypt.com/file/bidubaj.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/31283518704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bin+boliya+sab+kich+janda+mp3+full+song+download+djpunjabPDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC310 11624 bytes
SHA-256: 0df414694aaa7b6da4d0c1b74945e162112ca64c707bf02372aab53a1f5e21b4
font_01_sfnt_off0000de22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 16704 bytes
SHA-256: 9270c4cf840e84f18b4ab8aab31907b4de2c0e79d5e2f565356225852c09ea4a

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