Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f26797773e214f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 06:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7c5ff008d04d2a98de1d7a8376cea597 SHA-1: 3ade0fde99d68cf53fddb5dc0a3a9dfbe5a45f30 SHA-256: c7f26797773e214f8ee20dc89d5772a117f562ca8c01a34df335e806d01582af
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, many pointing to compromised CMS upload directories and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://krisoc.ru/uplcv?utm_term=saurashtra+ni+rasdhar+pdf+in+gujarati PDF link annotation
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdf7437817---22680683547.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/29155624157.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/jisozukelonuxu.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/gajaxuramuwupabemu.pdfIn PDF document text
    • https://ms01bet.com/contents/files/lanixutal.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/rosoxixa.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-18/20210918063435499231.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/damuzu.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/33935933747.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091109082473499.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af2f198c14---gurodidawemijux.pdfIn PDF document text
    • https://highrise.pl/file/vosoxorasuvajakadej.pdfIn PDF document text
    • http://net-work.cz/data/file/bavomegewi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/qtsp4rsm3guoro1q7qsu1e0s16/kamagamarobanapizu.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/87665419476.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-9/20210909003704614042.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/dosozivel.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/vifid.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109180843558551.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/23681969844.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/gekupogepinibovagi.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/pabovawafupupix.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_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 10784 bytes
SHA-256: 4c3e12d2ed3096dfe8da0a7c68d041afe8dfdae370f82a5e3b0f4dce7571d2a8
font_01_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 17788 bytes
SHA-256: a465bd52bc9c534f772ec5138d4763325efce15d3fde939f724567f5521eff7c
font_02_sfnt_off000127a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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