Malicious PDF — malware analysis report

Static analysis result for SHA-256 c782711fa1e68440…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 12:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 67f9a0852b8e6870814cdb48da017ca8 SHA-1: afeb367201e509b20f84a7ce808660454bffe9b4 SHA-256: c782711fa1e684400795db3003470172e746bf0bf0959c9a89405438bebd3c54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://quangcaowebsite.xemlaco.com/uploads/files/30217500959.pdf In PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/regeser.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/jabokutowuwosugifiwe.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/17048637901.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/12061282791.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/30848393011.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/kuvobegenumapaj.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/nejimoweriwediwume.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/1768221513.pdfIn PDF document text
    • http://herve-coiffure.ci/files/fofifakujugopikowiw.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/fefowom.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329a5c15dc0---21144992458.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/pezomozarup.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/nolevuditudoripate.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/banolaxokilum.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t3iv97jppp1g715mc81f1il9d3/15271538704.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cfc15fc13---nezuviloxexolemiburigolu.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/ruviju.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/rikikinapuwuwufepilopeliv.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/rutozofezefuvawiki.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/48346298647.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/40828987298.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/46322023086.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/girefasixom.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/58289435506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=stopping+pop+ups+on+androidPDF 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_off0000d36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 17660 bytes
SHA-256: f29df85015e5da8935c4b7c3e78e15d48ebb6cf2ef75f590c1057ca5dbf15ff3
font_01_sfnt_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 10564 bytes
SHA-256: 59ac409ba9525267cca5bd039db32ac415034cee68cbb39f4fd9504342e18f10
font_02_sfnt_off000118fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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