Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cae2265b17f6c08…

MALICIOUS

PDF

53.0 KB Created: 2021-09-27 22:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 904c48945b594873701e91d570cbcd50 SHA-1: aeaf20c1d4f1e88474fb481e0a5ac1b67b562c61 SHA-256: 2cae2265b17f6c08c8665e9aea51a6a9c2080216ca5e3712960dd0ff636028ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8560

Heuristics 5

  • 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.
  • 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.rosabrockenhaus.ch/ckfinder/userfiles/files/67893732624.pdf In PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad63feb79e---xawunu.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109181600346216.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0a27e9f1e---rilutefusukiwopeja.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/2097345225.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/74360181567.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/6672527768.pdfIn PDF document text
    • https://menu2uplus.com/images/file/55894795584.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/xupigedugodujunot.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/vufebisiwaxukogula.pdfIn PDF document text
    • http://autovoda.ru/upload/files/woxivavibarozemonora.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/movejelisojak.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/duvugiwugojijevuraxipi.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/26310448138.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/n51t8p24i7h6or8r60m4bs6pb0/jijadililunej.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091018032573499.pdfIn PDF document text
    • http://8njl.com/userfiles/files/gefotepigeluzaga.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210904225541.pdfIn PDF document text
    • http://hejia-ele.net/upload/47078629740.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/sakatabizobaletufowumir.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/zagutawumidazijativ.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/33093286495.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/20691852987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+i+do+screenshots+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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB209 10760 bytes
SHA-256: b0951351a831090e063b639bcb7e61634319b6cd87bc6f4215e728aaa9e924e7

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