Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d62d98968610e89…

MALICIOUS

PDF

71.9 KB Created: 2021-09-28 17:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49f50b6642b1329681fdadbeb26e2659 SHA-1: 6e7148ff54f72fb16ae527f55835a9a808dac644 SHA-256: 5d62d98968610e8928db37735584241eb6f2f801137e7ad5357531569d94a966
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the primary attack pattern relies on social engineering via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://pistant.ru/uplcv?utm_term=xcode+for+android PDF link annotation
    • https://bselink.com/userfiles/file/13420934046.pdfIn PDF document text
    • http://feminella.ro/upload/fck/dobukibodunefifutine.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/39883458245.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210904235421.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/6476721565.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/vavowiluxesikedise.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/01748fbd1d3533b7b7982c2093db7d9c/xipud.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/21816518951.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161434a3ee973a---lidilusagi.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/fetekabaf.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/sufusawewiguxisenikawi.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/13044387056.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/palavatidifafasif.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/wedubago.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/8625833519.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/turukur.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb4d8acdfd---mamunefesul.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/93635319588.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/dodajebujebedibexaganok.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/revebapusivu.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144e63e64e6e---73699637827.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/sasogiduxisi.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/92732349250.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16135f47c15915---vonufetoriwojimugavuvoba.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613895ef4daf1---78638187174.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/48956241370.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_off0000b6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C5 17412 bytes
SHA-256: bdc4f019933d7f1c6a4f0978a58eae307c3360d30138a12ded9449cd59827e32
font_01_sfnt_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 10164 bytes
SHA-256: ffa52abff754255711304d7176e1b2a34509a9702b1efa133706563d117ed5aa

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