Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e780091fdc7cedc…

MALICIOUS

PDF

82.6 KB Created: 2021-10-06 01:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0750737425ac41282ac4baf5f0773b5d SHA-1: a0fa4f6ecb6fe9d150793db7790d7b8ddb1e5f3b SHA-256: 5e780091fdc7cedc2cc2e78a15d6d018d0ba87c428f6ac8e3a7d2f2ccacad98c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://linhkienhunganh.vn/luutru/files/jonezoxetajipabi.pdf In PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/4c1f6ff774b6c56ed9416845a7dc39f9/jufoxorum.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/fabakimo.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/pepusopiroxumenukasogoxu.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/65281242778.pdfIn PDF document text
    • http://ewtch.com/upload/files/musulusuvonaj.pdfIn PDF document text
    • https://dafelia.com/files/45424946336.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/70216981913.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/napux.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a39a8c62ea---fojufokalojekifoni.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/vefejepidi.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613458f16a0e4---zifit.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/jozerikamokixoduraxirote.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/bebekoguwetegadi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6d1a6695a012789b8764ab5b74ca656f/silivamese.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/soloziximituxemuza.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/55239284219.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/49936020172.pdfIn PDF document text
    • http://slsnn.ru/content/files/robefanibede.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/43624473073.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b17733e008---duzupid.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/78032033730.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/vifusedijunawotoma.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/jetovowasofexudezirigugag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cross+validation+for+logistic+regressionPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/54b5f475e3d32d3ffea9a7d395c5477d/28873761180.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/80314552741.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_off0000d95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 19600 bytes
SHA-256: 6593c0b9d37e2d85b73b18876ae3eea1ca9d97252fb2d2169f5e78ace178dedf
font_02_sfnt_off00012388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12388 10748 bytes
SHA-256: db10e9cbd60fc6a8c5db6c6560f45b201aceeb58dd18ab3a0148998db59076b7

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