Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9ece5bd6a1c78e…

MALICIOUS

PDF

75.4 KB Created: 2021-09-15 14:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 64ac68d943f1d7e0f4c94c548f77658e SHA-1: 63ee23c9efbabc45b2291c8854007ff02c14343e SHA-256: fb9ece5bd6a1c78ed35de214dfa59155bd986d5b8ea5173a3a654e3754611066
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress sites. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious content, likely for phishing or further malware delivery. No specific script content was detailed, but the overall structure and heuristic firings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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 http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ee740faa7b50b6c5d862b66956a0b6aa/83407570008.pdf In PDF document text
    • https://sharedsynergy.com/userfiles/file/timudujezeki.pdfIn PDF document text
    • http://punaide.com/userfiles/files/xabinam.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/51032534114.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/pimunimobepijikesina.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141321547aa0---8769748184.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/xovadigoxowige.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8d64d9a03---befufew.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/1408572174.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/ralivinarosenipeno.pdfIn PDF document text
    • http://orderkai.com/uploads/files/kexetasudalugiro.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///42368466804.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210913_246991352B5B0B9F.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/89282006327.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/lopimasituvipomejonugip.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/3512033836.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202199185007628.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/49994844881.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/8b7afc0cba36a34ae49ba53e16fa4354/feketoxowu.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/xumojupive.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/17796384144.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/f2f3807b81a9ffd8ed96066d782c322d/85369525290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mini+militia+android+1PDF 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_off0000c79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79D 16220 bytes
SHA-256: e59dda58bd8e9935d42ea673d1273fb35dfed1545ed1a626abf265968d18e4d2
font_01_sfnt_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001097a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 10152 bytes
SHA-256: 40f4281c2593c5be92dfced17eec97fd07691f0c40d1ec408e0944685b9e2c16