Malicious PDF — malware analysis report

Static analysis result for SHA-256 47963545287521e5…

MALICIOUS

PDF

78.6 KB Created: 2021-09-22 20:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 38f8530b3fa9272e1a765dae004717cf SHA-1: 83bca2ca1ac6c77feb9e5de91e79564c0aac2b06 SHA-256: 47963545287521e50f753c54b84cd1af31c15983fd8b870a081fd100d9e589ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of multiple external URIs and the link farm structure strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://laborke.ru/uplcv?utm_term=sat+test+2019+pdf PDF link annotation
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/304f24a8044fab0492b217de156dcb62/74877398964.pdfIn PDF document text
    • http://canoeing.by/pics/files/59830511914.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/vewimagevejaxaxon.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2mhbtre53d0aehpa8rot38ptf8/56974879631.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/86694343286.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/kunux.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/buwupex.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/4740053799.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144157f26669---xudafumafabopegagolidis.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/92801570461.pdfIn PDF document text
    • http://futboltotal.net/images/files/77182148484.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/rokekamunubirulexoz.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/dupanevu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/db18f2ec638aa47d180884e83f017201/xopapumujarelotarifegafub.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/mopilonegozuvutedawupamo.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/95015989809.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/pipukiluzikavutal.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021921052137504.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/janimurefokokigut.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/bopovonovodanujidajid.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/levuwadijikopeparob.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/nasanogiwixob.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/58890934918.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_off0000d20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20E 16568 bytes
SHA-256: b1393cf1383bc2ae6bfb9cfc59d36062cfbab645f17752a951abf1bf6b737e9d
font_01_sfnt_off0000fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 10568 bytes
SHA-256: 91e4f5207b2e7ab54236dff8b586480b32b8ec310aad1c22a8e707913cdded7e
font_02_sfnt_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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