Malicious PDF — malware analysis report

Static analysis result for SHA-256 5093974404b8f886…

MALICIOUS

PDF

81.1 KB Created: 2021-07-16 07:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 072b9697800f0384d392aaa4ad68012f SHA-1: 3cb782038ece9399f08f02e0646aef1e85527df7 SHA-256: 5093974404b8f886cf09e1473b5328afaca0bdef2de7c1499dbcde8a9a455882
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or redirect to a phishing page. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to exploit users seeking software converters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drafthe.ru/uplcv?utm_term=download+software+converter+pdf+to+word+free PDF link annotation
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/83229414051.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/97760409387.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/85bd9758b05594698f1626563bdae32c/71109508023.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/ziwesujavinetil.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/marajukakadezo.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/53046406404.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/gapulanawigesaliker.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/42387121033.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0507bc98a---muzoxisorol.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d495ae1ee3---buwefapidajukotiguzaga.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/piwagulururefezelumunux.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/7239778333.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f426ce1f96---nosejokuparaka.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096d02889c84---61504397278.pdfIn PDF document text
    • https://led7.ru/file/5863397935.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/64297784933.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/dc5f5b52ff7f867f1670abe6b1798074/fubuwabimativof.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/60240767086.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/c624abed1e3d422e2ea81185767152d6/vekiziditosafusa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990e1ddac00---tefibumuk.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_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 17240 bytes
SHA-256: 5af4da3b6769a49653806d1d85809db45ea03aee4fad7bea90d0e74bfe8f9188
font_01_sfnt_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 10672 bytes
SHA-256: d04cd11ce300244c6a5e596916e876ece9701ecb5497659576ad206acf0fec2b
font_02_sfnt_off00011f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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