Malicious PDF — malware analysis report

Static analysis result for SHA-256 67eedd2010728d80…

MALICIOUS

PDF

70.1 KB Created: 2021-09-19 00:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93e610cbab65c7b6b85826b669bcc66e SHA-1: 288e762265d399cb5c3840d2f88816f8a547dd6b SHA-256: 67eedd2010728d80800ec36241ff50c20ac5352245244dc2843538f9537d44e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress sites and other unknown domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to distribute links across disposable hosting. The primary purpose appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b58ae0e03b71869fcd007c15fed03f73/50193759622.pdf In PDF document text
    • https://odlingfamily.com/userfiles/file/542628728.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/numeserulireli.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/94391485856.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/gorutaz.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/43062239795.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/povidepebiposu.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613511b61e649---96215181534.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143e8f0f3fa7---61696547371.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/65925695994.pdfIn PDF document text
    • http://hflchw.com/upload/file/fafatilawetuke.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/pawikek.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/wakomevi.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/jibotolufufarevuw.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/moson.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/kabawededopi.pdfIn PDF document text
    • http://ducnhua.com/upload/files/lubebonabipamo.pdfIn PDF document text
    • https://eurotig.ro/file/24298940493.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/gutibojax.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090312123728.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/13023543939.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/dovexakeruveke.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/1025285210.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/figazovegilaxib.pdfIn PDF document text
    • http://artdental.hu/editor_up/tuzazejelisavap.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/jefukopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tizen+os+play+storePDF 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_off0000b3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEA 10380 bytes
SHA-256: 5ee6156fa423261df9e31ecfed266fcb5ec5001158c7e0b2dc154ef9fa2dfb45
font_02_sfnt_off0000e3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 15464 bytes
SHA-256: 72d69fbf55d51054c14704a65146a1c1a3d0ef1c1fb0103ca1129b8f78c520da

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