Malicious PDF — malware analysis report

Static analysis result for SHA-256 7603de568cd6b0e8…

MALICIOUS

PDF

78.5 KB Created: 2021-09-14 18:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7b0d328986d17190e88e555f1d3edb6f SHA-1: 710ad4d21fa406821b612af0ad05f45f38904b35 SHA-256: 7603de568cd6b0e802aebf7e8873e25be4fe5c36d9ce447b71c2a0b788f9a469
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further 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 https://cructi.ru/uplcv?utm_term=how+to+browse+anonymously+on+android PDF link annotation
    • http://a1-automotivegroup.com/upload/files/lawuvuserixotolifuduvuzin.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2785f1dd971e1311de6e112e805ad51b/jusebapu.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210902_D715ED5C13E7A24A.pdfIn PDF document text
    • http://skncn.com/u/files/tofebamuzumat.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/fitenozepumabuzisito.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///doniruxe.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/92684864762.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/kerod.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/62789941829.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/66051876974.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/iu508ka20utu0tu27ahmm4vejb/70024527343.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/79150100129.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/69745871669.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/70304930186.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vegotogegu.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/metari.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/15587822155.pdfIn PDF document text
    • http://dogable.de/userfiles/file/87061902544.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/37342560736.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613782482b74c---kijisetadaporetodemenopuz.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/21874883172.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/denufixuzutugopaxila.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff95eb768d---65815733545.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-14/images/files/vagowu.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/xezexolapu.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_off0000cd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 10840 bytes
SHA-256: 312c84d78386c88603e1582d6aa65e1f31dfd4250eb70a916c8f26336086bf1f
font_02_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 17780 bytes
SHA-256: 8ce84616957fa34e859f6ee9c248dfba975c6c1452deb3e1015662b630b5f324

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