Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf01e084d1d9fad9…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 19:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60c3a7c1b60f925aaf2d4cee9bbd21e7 SHA-1: 331cf13fd08a11aca1f56cbfcf8c9914a6e971f5 SHA-256: cf01e084d1d9fad95e203e6668e40f592ba896b2bcead5c139ae2ee2c53f2f6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://chcial.ru/uplcv?utm_term=how+to+put+a+password+on+android PDF link annotation
    • http://1-cities.com/blog_images/blog_/file/mumizumuluva.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161500d5a47b52---24431490488.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/14510876379.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/zezuxuwujaxored.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/basakobe.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/81754158370.pdfIn PDF document text
    • http://clubberia.com/js/ckfinder/userfiles/files/31329928841.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/81495408811.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fefetolovivusuwoxapu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150c57cc504d---nizizuga.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/8147440157.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/45307593397.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/210223125847.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/sesudunutogi.pdfIn PDF document text
    • http://proxima-design.cz/files/file/xukabejebiped.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/kenivugazaxexurelufa.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/25621922412.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/zujetu.pdfIn PDF document text
    • http://one9five.com/userfiles/files/jezuzudatilebepadi.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326214d2c97---83969474737.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/61665952774.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/77143570585.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/66187285555.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D6 15344 bytes
SHA-256: 3cec11ba5b345cbb4b5a7dbb2c78191002d559b11b1cb67f1ca0bb19a92eeaa9
font_01_sfnt_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 10384 bytes
SHA-256: 4f8f4d2db1993ee88208c3bb4379889340f60756b5d24ad2db989d2401f360b5
font_02_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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