Malicious PDF — malware analysis report

Static analysis result for SHA-256 730cb446c2d405a2…

MALICIOUS

PDF

63.6 KB Created: 2021-09-25 11:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 437ff6d0c00fadb9b638446b6b7a38e4 SHA-1: c6efa1ebeca317853d6b8b388f4f263997b96499 SHA-256: 730cb446c2d405a2748185d29189922b85a783cd36db874fa2e5482a0d555ec4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs and the PDF structure suggest an attempt to trick users into visiting potentially harmful sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6907

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://envigest.cz/upload/file/pulujirukupugarotawi.pdf In PDF document text
    • http://yuh-tarng.com/userfiles/file/zojavajo.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/fiwozedotasujezej.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/51757127926.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-14/20210914010814405920.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/gevewelidoxodajel.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/sitatub.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/25137071437.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/25478616971.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/27157463730.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/76615837951.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109170546362812.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/dipitezunerufokasugibo.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/papuzo.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/dorokisozen.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161444dc9b7e21---nomodebomeligafuxitimat.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/lajifonemebek.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/seruzalove.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161326752ad62f---bosapoludodewuwira.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/tilunekaloteworuzixamure.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161483cf06a332---12922376286.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/51644741842.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/67818901938.pdfIn PDF document text
    • http://pk.mo/userfiles/file/75379217112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=data+structure+lab+practical+questionsPDF 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_off0000b51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51C 10752 bytes
SHA-256: 31bab63434ab545633caa16c2b8da6b9faaa8c86334752ea196171808010336e
font_01_sfnt_off0000cdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBD 18056 bytes
SHA-256: 98f0e43d8aba98e0e35a40770afa7ae9ec8c476b08ebb2f8c2055e69d379027d

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