Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e72fa27260e85d…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 00:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3126f083c192e119f9f58bd725aaf2eb SHA-1: b84eca68efd1357a45757ff21b41d561d2d69fd2 SHA-256: a3e72fa27260e85db17c8e42e4e1d2c42de2c80fa0b4395d71b41c38873dcd62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains JavaScript actions and numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or facilitate malware downloads. The presence of JavaScript suggests an attempt to execute malicious code within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://huntic.ru/uplcv?utm_term=metal+slug+code+j+apk+download PDF link annotation
    • https://madeirashopping.com/userfiles/file/79332062332.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/livefa.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7dd42e59---vixiseti.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/28823558984.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/dizaw.pdfIn PDF document text
    • http://sayurmateng.com/contents/files/6571615074.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/16376245349.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210911104328883.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/jomulemabe.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/dizinup.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/dogumojarakafaweg.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210906_702318AA75FD2F76.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/20056947366.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/91843082533.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16140a76e03e91---43330030846.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/vubuxuderasiteluwaf.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210915_BE0023F64BD4D2C5.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/jonitekonige.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6ece42239---purasebetitagavujeziza.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/safimusivarajizuru.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/9558305738.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/bejaredoxige.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/sekiruraji.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/71866817558.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_off0000c3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BC 10900 bytes
SHA-256: 3190528041df366075cd2d21e76dacb0a4da996a802b202e113a0104e0080106
font_01_sfnt_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 17488 bytes
SHA-256: c93f0bc1984f294d6ed7674dc2f25c4efd18118efc36d8d0f52b15d3f87b51b1
font_02_sfnt_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1