Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfe2bfb44fc3d66…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 12:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e6cde6e606d41d58fede6eb2d55c9b80 SHA-1: ea9994b652a5164b0b08caf652617ecf96d6ade1 SHA-256: 7cfe2bfb44fc3d66d28625524d344337385667d7cfe896dbeda5ee33405e7cd2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised CMS upload directories and other domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links to potentially compromised WordPress sites and other domains points towards an effort to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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 http://arndt-fahrschule.de/userfiles/file/resubizeteweve.pdf In PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607417377a6ed---nasivukivusezezonori.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/f0467cbc95c2b67dcb4c62033c1482d7/61884729435.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16098238370cf7---64005978494.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/66522022086.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210722_6E7A46F9C1105332.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/matijibasiluditawigodexip.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/86237943945.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210709063605896344wdutnzz6antp.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160912d34473c7---sijuru.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/finiteribesig.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/wotipafiwes.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fed8c2250---boferul.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/31094401635.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/57140039860.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/fajusogawena.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16113b2bd027e7---13950949960.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/eea91e1ffac7764e6d0f6b8497e8e0d8/58418772386.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/gidupejomirijekarovuvow.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16125cb7238133---bobitixu.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160718ac87a8ab---9308905507.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/nunop.pdfIn PDF document text
    • https://kimcert.net/E/file/jufufatawemuwa.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/77181732694.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/riredumivawogebasipibiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=tensor+calculus+by+barry+spain+pdfPDF link annotation
    • 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_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 18764 bytes
SHA-256: 0b5b8235dffb12af80ad983b5c17745674a1eb357f112ffed44dd92f7a254fb3
font_02_sfnt_off000121ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 10832 bytes
SHA-256: 616651bb32a46a56674a0ecef247f2d259109ddfe0aeb39919a94a202d09eaa9