Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cea95a4e20ca989…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 22:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cac6dda758b8edf8d11bde5434ee74a8 SHA-1: 37db5eaaa982322b4e081063fbd16989dd3d0bd5 SHA-256: 5cea95a4e20ca98937bf49f4d9cb4bc98175d9731a6d33b3bf9894d4bdba5120
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to external PDF files hosted on potentially compromised or disposable domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to drive traffic to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://3suntech.com/UploadFile/file/20210911181202198.pdf In PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/tokimo.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/5970506620.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/b5cgdiekekt5dc3u5u8jdccdj7/rutodu.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/96628373085.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/43853043482.pdfIn PDF document text
    • http://maintogelonline2.bet/contents/files/38331250839.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/41429942712.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/70789700646.pdfIn PDF document text
    • http://fitviewer.biz/files/file/natojodaxaririka.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/jokogajaroxuvurekimaxajo.pdfIn PDF document text
    • http://learningkey.org/userfiles/xavaxumegamun.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/47ef71d62776040683880b3648d6edcc/gazajet.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/15048172387.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/16946738153.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/aa9455528b8546cfc138052fa3b47d9c/73772536577.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/80959386660.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134022f274b5---11235258018.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/juwej.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/42884459657.pdfIn PDF document text
    • http://www.bash.cl/media/file/paropejotesunakedapowep.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/puroxunuzimuj.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/vuvisewafafunopemutebimit.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/fopimonerepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=imo+call+recorder+appPDF 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_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 18448 bytes
SHA-256: 2d8453ccfede329db01cc346073ffe264d1472ce57ab8c528b96b3ffded8f419
font_01_sfnt_off000105cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CD 10164 bytes
SHA-256: 64b4889d2202a91867dba33a01675c95e77680e9961ff8422796b9578535a5d8
font_02_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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