Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d346a0a6128c12…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 13:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1739fd0b35ec8f41736876e1b04dd2d1 SHA-1: f95c6eac3206dfbd4d275fe7e8daed5609da3d9b SHA-256: d8d346a0a6128c12fedb0b40872f025517ec57df6ca856c9937ce7a3a354ffd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=listview+in+android+studio PDF link annotation
    • https://cambodiaangkorhomestay.com/userfiles/file/62026666309.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5d2426df---kudaxinomakupunusetewumox.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/40411916213.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/donixagozinagupiguju.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/40943738337.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/paxegetalelatitew.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/90967018248.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/takafo.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/87154848340.pdfIn PDF document text
    • http://neowork-rh.com/userfiles/file/benaril.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/53017588557.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/firutod.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/fawinus.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614a23f743aea---renumoxarowutuxusivad.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/gamejezolovezemi.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/92223033931.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/xemezonolumoxozemibatul.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/midekolinexeduwiwegovoti.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/wiruvadaxilibuzopomufuli.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/5ef086d9e4dc8a77927c4a0420e1343e/wefowelawaresaseg.pdfIn PDF document text
    • http://vititanon.com/user_img/files/kukidujozekibadameniv.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/sexodupofoveletewinikuzu.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/40183260053.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/sukeviguxub.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_off0000afa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BB 10404 bytes
SHA-256: 940b52d5b31cac1723372c789fd19d5447aee5e0f917b1c1086c051124a442be
font_02_sfnt_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 15600 bytes
SHA-256: 268a9e23652e7e3246d0ee5c23c80ce8a5f94195e8878b52bd94225ac3629ecd

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