Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef765849d93749f…

MALICIOUS

PDF

60.9 KB Created: 2021-09-29 07:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2d4ac7e9deb2d9a76b6fbcddf0544a4c SHA-1: b45b6ae19f83377a9f8dcb270229d6d135453755 SHA-256: 4ef765849d93749fc4e01922244fec297df3e2e94da95dd625f68bea132f430e
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6567

Heuristics 5

  • 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
  • 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://www.macrolepidoptera.hu/userfiles/files/gisosu.pdf In PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/zofezekav.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/fulubofafefoxeneka.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/suxofibu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614634cf1fff4---kinebefukiwu.pdfIn PDF document text
    • http://ipllaser.in/uploads/serolafepukorovele.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/61089784526.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e7874ed5c559b882d5bb4d71c224de43/14118429909.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161360340bc618---62218187087.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/rapemarepojewiximo.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/50807570332.pdfIn PDF document text
    • http://hbaoge.com/upload/files/rotamexusolilewome.pdfIn PDF document text
    • http://lawngo.net/fckfiles/terugigulazidede.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/22123382463.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/bavizewolijibizike.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/94120781087.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/mipeme.pdfIn PDF document text
    • http://ducnhua.com/upload/files/78173291596.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/1433656783.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/jatotomudegalitisutiga.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614590ae3571f---35490627577.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/sulukovelosegipabor.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210928163284790682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+get+out+of+safe+mode+on+my+phonePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 11088 bytes
SHA-256: 0b5ada5d43ad3c756ea47bc036f04faff4c0e90c4b70caeff0fd6b84c81c08ea

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