Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2bdc374701a9c5…

MALICIOUS

PDF

90.3 KB Created: 2021-09-07 02:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6e0be549b325d6c16acdedbbf2610d40 SHA-1: f088eb941be632e8e8cb75aeea34db3dfc5e1b85 SHA-256: 5a2bdc374701a9c5c3a324548398427e94466ce9f33ecf1f5ffd597062e95f07
156 Risk Score

Malware Insights

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

The PDF document contains a link farm that directs users to multiple compromised websites, many of which are hosted on disposable domains or use common CMS vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malware or engaging in phishing activities. The embedded URLs are designed to appear legitimate but lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1a4213ba80e77797eb397ac31b4094fd/gowevedopibagerediti.pdf In PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8da8fe9e08ec2a60cece608e354a9a26/33225828066.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/28304716490.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/32552798379.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a8f2514e---39183673282.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/c31ba02d047e9q4q09pa0e49d7/kaxolewavopo.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/54883726791.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/38372315789.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/3983952187.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061304251877.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160869e5c4de32---nupipi.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf887b07a56---sevexinikedazilowa.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/9157099395.pdfIn PDF document text
    • http://www.pilartangguh.com/file/gawibewu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/14f4eec4b97cecff1b66fb21ab63acfb/86537966691.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/49051601519.pdfIn PDF document text
    • http://bdn10.cz/files/file/toxavukixazegewami.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2bffe839c8621a41c53bc7d0e153e2c2/30303115767.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/burereradosigadafogeru.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c3679a82---jamuwobavirasimiwisusire.pdfIn PDF document text
    • https://blugarden.eu/file/doterizaxupe.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/xudolurizudil.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/vizixapuvikusoja.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/daxapimaw.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cef5a0107e751577c193ee998c75e9fe/taxogevuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=panasonic+viera+50+inch+plasma+tv+manualPDF 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_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 18368 bytes
SHA-256: f43b47c8e7e22bd17b0c740c80cf5c4345e9d915559ecaec0dbaa54138e0a9c1
font_01_sfnt_off00012938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001414f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414F 11064 bytes
SHA-256: 445893546bfc168a9fb6c2bbed2d7b15cc827e9413ba7213de9ee3bb434d99fb

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