Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec34ac6580e16578…

MALICIOUS

PDF

60.9 KB Created: 2021-07-27 02:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aaa7b93b09750c22d1df0d56236ae9cd SHA-1: 319452a2b628d4d9ae425df03a6cc6d9bed64c88 SHA-256: ec34ac6580e16578a842c80f9540bc72397dde79787c0ed1cc95b6b47eaea31e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of these links and the overall detection score strongly suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9701

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 https://europartner2.pl/uploads/38753353424.pdf In PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ae078e56d---gukosu.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b968d34c830---tewaribaz.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/95137459145.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160783e55e97fe---putupenobumavedudusuras.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/79902351031.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/76424860675.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/741b51c75746642cd5f007df0fd54e07/bidopanerigeb.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d8db888be6097c49fd76576fbd3e2755/33475937851.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/djfm0oe1n200l6aiusc8gr5tl1/5669188719.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/6c5cae180b03929288984b9f9757599d/dopilifizisisaxil.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/45722008324.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/numoxelimuxori.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210621_CF81958192E3FFBE.pdfIn PDF document text
    • http://www.emailposte.com/pictures/1285224236.pdfIn PDF document text
    • http://www.manorbymajor.com/userfiles/files/posunudujovexipejipukif.pdfIn PDF document text
    • http://centrons.com/uploaded/file/148024888060d54abcb4422.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094774797adc---xolizow.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/xudugofebuxegenelejamadob.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lcd7nvqtnbmms0nsn9a472a123/giwotod.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/44365625924.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/boporajama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=virgin+pulse+login+pagePDF 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_off0000cd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7B 16664 bytes
SHA-256: e598c28a979cf15c225bbaebe00273c8f30e6821292e6f3092175a2d876ffd61

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