Malicious PDF — malware analysis report

Static analysis result for SHA-256 733da56eda041447…

MALICIOUS

PDF

82.6 KB Created: 2021-09-24 18:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 211429f1bb63a6717eeea1d931d73687 SHA-1: 0a3059d7e2a89ae007acf2d455c7d83a976815d7 SHA-256: 733da56eda0414476a99de4974739dd0d1d030bb7e75555a0630d4b33560c7e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous URLs, including links to compromised CMS uploads and disposable hosting, suggesting it's designed to lure users to malicious sites. The primary function appears to be redirecting users via a link farm, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=the+oedipus+plays+of+sophocles+paul+roche+pdf PDF link annotation
    • http://tokyo-sanritsu.com/userfiles/file/9165520149.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161320b24db309---65471944588.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/rojemozijefax.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/79106805941.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/5975067024.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147fdf0d7157---zaxazigufetetunolima.pdfIn PDF document text
    • https://kor.mycultureis.com/FileData/ckfinder/files/20210923_B2BE920F2F90C81D.pdfIn PDF document text
    • https://alkoplast.rs/files/bipolabigivuliriva.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/xunile.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/15093713362.pdfIn PDF document text
    • http://ptktent.ru/userfiles/file/numulakan.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/buvoxiz.pdfIn PDF document text
    • http://hexindechem.com/upload/files/99345642911.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/72053280433.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/88733600959.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/linuvunotugesa.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/linepasif.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/19788133138.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144696a7054c---lifuzag.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/siduxewefupewe.pdfIn PDF document text
    • https://halkum.rs/files/suragexo.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/dedekeviselavigibadujenin.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/wozetamapum.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2da8d9ef1---duvutemusetepimejomapi.pdfIn PDF document text
    • http://cochemical.com/upload/files/50341349219.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DA 10692 bytes
SHA-256: eca306312f81df5a960b4193c406a02a281add5020584c071d3ca1cdd095827c
font_01_sfnt_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 19420 bytes
SHA-256: 60659869524765d840b0336fd9f8ac112f12d09944915c7857e4343c36b27f2a
font_03_sfnt_off000123b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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