Malicious PDF — malware analysis report

Static analysis result for SHA-256 64724f82ba93a820…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 14:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 50025c2f0fcb6510a6fae9b982ef521b SHA-1: ad787ab81d9a19172760f43c769465ca53ec36e7 SHA-256: 64724f82ba93a820c0a07d97857527a05a4ef0a709a66e82674043171e380302
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest an attempt to drive traffic to potentially malicious or phishing sites, possibly disguised as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://gulfapex.com/uploads/file/16983480702.pdf In PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/nijikizugorogomizutiziguk.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613928cd5aa5b---fesavi.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/63079845267.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/94809404748.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/buwutobejizawopazelad.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/bibitedakitot.pdfIn PDF document text
    • http://abc-tel.ru/data/File/mezajoruxadigakopavit.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4e727c815dd41076567bd483f960c374/16146822947.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/dolapesipededoziwuxafurit.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/33651923088.pdfIn PDF document text
    • https://wildnaturetravel.com/File/suzuralorupibu.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/madudamuxejowo.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/dudomeditijovafopemawew.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/minubedofifuzezivelime.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/73203520976.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210903042138.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/wipibaze.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/fufukevevom.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8045a27e2---26898617182.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/nuwuferanulaxo.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/sigetowunotepul.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/fijufilazarirosigoziwen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+use+911+vpn+on+phonePDF 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_off0000bddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 10412 bytes
SHA-256: e62684c0fade212d5ef291c8ac61eef83f8de80092fa28c193d521e51aa666ff
font_02_sfnt_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 16176 bytes
SHA-256: 44828ad33ae4f401346334ff5363e203df7fa0f1361cd6b5bfb587c1680833d6

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