Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26b408dcbd4385a…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 03:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6507a34a9b49df0af91dc493095ad545 SHA-1: ffe7a33b3ada738b9a48f6573b7b78125f83aba3 SHA-256: f26b408dcbd4385a42bb5285786d71c35e8f110c3c291809ca66134af11af355
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, containing numerous URLs that point to compromised WordPress uploads and disposable hosting sites. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7217

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 https://ketchas.ru/uplcv?utm_term=scan+with+qr+code
    • http://mdknoodles.co/uploads/files/78431575207.pdf
    • https://lenaoyunlar.com/calisma2/files/uploads/19829046748.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe706dc9a7---12939539135.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/00e384cde264ebc961759676e9fedcfb/nogis.pdf
    • http://fuhua.tumujike.com/assets/upload/files/202109130503361533.pdf
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/kowidolof.pdf
    • http://www.farmaciapenil.es/userfiles/files/92400910970.pdf
    • http://17njl.com/userfiles/files/zirix.pdf
    • http://kcpsystem.com/userData/board/file/29970440018.pdf
    • https://at2-turbo-j3t.com/contents/files/58633132119.pdf
    • http://thaide.org/userfiles/file/pezagovosup.pdf
    • http://chiangmai-clean.com/user_img/files/jirixatimitajokiruza.pdf
    • https://bisleri.genefied.co/ckfinder/userfiles/files/fudedemixux.pdf
    • http://worldcar.jp/userfiles/files/zovikifelafibekitifivujen.pdf
    • https://www.hsbofmn.com/ckfinder/userfiles/files/91121658413.pdf
    • http://fli.edu.mn/ckfinder/userfiles/files/kiwawon.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a33acc4ff---palafidezizunaneronutujo.pdf
    • https://abzesolar.com/uploads/files/24248073792.pdf
    • http://hamdannepal.com/userfiles/file/71660785984.pdf
    • https://10fci.org/userfiles/file/vibaxaniwid.pdf
    • https://insinkerator.us/images/uploaded/file/kafekogirureba.pdf
    • http://mientrungland.net/uploads/image/files/pavokubiluwejuxex.pdf
    • https://amt-alarmy.pl/userfiles/file/79560708520.pdf
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/56150630146.pdf
    • http://offerseir.com/basefile/offerseircom/files/50693681752.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe9.bin
e29b6f4efe18bdf489a57c4b023cf8508a2ceab6e9b26125c2241f75e9e89ee3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 17944 bytes
font_01_sfnt_off00010e41.bin
65b1f346086d6b0faf1799f2da700b686a1504736119efca94b8107a55a96282
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 10560 bytes