Malicious PDF — malware analysis report

Static analysis result for SHA-256 5693b35fe53a1458…

MALICIOUS

PDF

96.1 KB Created: 2021-09-03 17:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8bf7ce287b0e24de6d1340b1f9147d55 SHA-1: 351c56bb8b78f72db5869fde2bd6eecf052dbb42 SHA-256: 5693b35fe53a1458bd1cbc3c52e0b344437594fa527b98892de29df23c16ad58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites. Notably, several of these URLs are hosted on compromised CMS upload storage, suggesting an attempt to leverage legitimate but compromised infrastructure for malicious distribution. The presence of these links indicates a phishing or redirection attack, likely aiming to lead users to malicious content or further stages of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://studiotecnicodavico.eu/userfiles/files/xuduvinataza.pdf In PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddeb17c526---12191125771.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/fisapopu.pdfIn PDF document text
    • http://expresskaliski.info/file/xebavaboxi.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210725024449.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df31d6fdec---kimenedixodogoko.pdfIn PDF document text
    • http://le383.com/uploads/files/28688730007.pdfIn PDF document text
    • http://bakoca.hu/files/file/90939704171.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/tisukoxeperavu.pdfIn PDF document text
    • https://digireg.sk/upload/xonebe.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/42al5kakpbau2q55kq3r370oea/buvalarijokujorobuwu.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/43730894304.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/24505576205.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/nudafifanodiraw.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c23d16687ecab9a35e3c60572015dcfe/mawakulikexujamim.pdfIn PDF document text
    • https://pellevah.com/upload/files/xeluzaxazepuzifilategudin.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c08a1d40529---10313534139.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/gowetuxisokosiv.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/87148434201.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/zoravuwekodilopul.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/43002904090.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/eeecbbbd9cdd1c1243a19ca2ddfe8dab/lurasavidavenaxamo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d6466c4e588---51544053112.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/lenapok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=vocabulary+in+use+4th+edition+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_off000111a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B6 18072 bytes
SHA-256: 902dccdb430c053821fefc526f2bdf62722acc6ce25b42a7f280b3fb90fef834
font_02_sfnt_off000158da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158DA 11116 bytes
SHA-256: ed33af12f84e4e678517e758fbd446a31397cfe1f5d11072d2feafcbf21bfb8b

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