Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dca40499148400f…

MALICIOUS

PDF

79.4 KB Created: 2021-09-10 17:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 09864529b5f4afd5a59aba431c5062be SHA-1: 1912641a1b136a88cb1301648e6a170682d8bdf4 SHA-256: 2dca40499148400f3bef288c6bc84c77ea31cd62a5161dbcdde4a9911c0fc32a
164 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's part of a phishing or malware distribution scheme. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kaskad-74.ru/images/uploads/19069030997.pdf In PDF document text
    • http://kozelskadm.ru/files/uploads/files/53392251088.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/voside.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f4381aba15e6f231d8912670e8f30ef2/filojawetajajizomevalovij.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161323078acfd1---kobug.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/63950474843.pdfIn PDF document text
    • http://iucecb.com/files/file/1408907440.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/55691875818.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c428c365---65937224124.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/tetisofadoka.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/75040395957.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907221514433020.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210901_071558.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/nikuwuruwimanovosekib.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/lodanunibebeleromatisu.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/zizolazozazaru.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/25340770240.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/tides.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/jifuxe.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/wanunutabagokotigejo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/gfevpd1jm338ajamibdj0321l0/lotoxubefezuwiwuz.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e26660c69a48f2eb642f6184351e05ab/54043099408.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/jebibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=zombie+hunter+game+mod+apkPDF 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_off0000d159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD159 17876 bytes
SHA-256: 19d53ccbbea068ca7f80644098b781b1f88edb166003a50a9fe4d6fb93b16206
font_01_sfnt_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11736 10920 bytes
SHA-256: e1da2a45ce03de05743c377a4d87c747d52dbcf0676b3a9e9bc53c4c15e7bfa6

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