Malicious PDF — malware analysis report

Static analysis result for SHA-256 30ddbc4eb22928ae…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 17:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 843e4fa1242336c4a7e6608cd9d7b11a SHA-1: a7e9d5e422e022a41f2cd7b68fae33ebe3542057 SHA-256: 30ddbc4eb22928ae7baeb4bd4aef8dd53228fd6b0940fbcf4f21f808eb220519
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to distribute malware or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely delivered via spearphishing.

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://wastran.ru/uplcv?utm_term=damon+ps2+emulator+pro+apk PDF link annotation
    • http://855solution.com/htdocs/cljr/data/files/mapomizogil.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/bititojedukevowitaluxuki.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/vakutazuji.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/lulegupo.pdfIn PDF document text
    • http://vswet.ru/f/nisiwogiberagejudalatub.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/41324403844.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/serero.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/36224284474.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0fc0c48e2---rovidowolitedowe.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/11478750553.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/vamuv.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/663ba7f037ef04afbd4bb1e362df0249/besuxexalaweduxe.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/34442764783.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/81793842070.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/57868823451.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16139d06c0bd5d---setudutobigabofibudi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea6e6c8ecf---dujugazumopibixurude.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/begoniwuwivi.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/31353643033.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/fivukuzivotubagesa.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109030508113751.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/jufafekosokif.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7c730f725227a6d6e48ae8de73cdde62/bawilusesu.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_off0000cddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDF 18772 bytes
SHA-256: 8956010fd7b87b42938f7dd20fc33dbaf1075997bfcd208e270772d36412bee2
font_01_sfnt_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 10636 bytes
SHA-256: 587245c9659d13735adf072a5cb21c4dcfcda4dde95e0d72757c64756069b2e1
font_02_sfnt_off00011627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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