Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e6aca7ee792f34…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 11:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 69338db7b8371da52754e24c5b6f5540 SHA-1: 7492c4a12c788edb54ab072d5a024d5db3a3fd56 SHA-256: d5e6aca7ee792f34439660d59e1c9644398bf8ac7fad36b6bd6a80f033c64e4c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. Several of these URLs point to compromised WordPress uploads or disposable hosting, suggesting a malicious intent to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=unblocked+games+66+77+99+minecraft PDF link annotation
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/dajiwilafebunivegata.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/sopupepawijivubuge.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/15024823648.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e99b56cd7---xaxotutep.pdfIn PDF document text
    • http://baoveantam.org/upload/files/69363057817.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/venegotomavalidez.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/zevelatosarofij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e3c44574a---winukuwar.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/mufufumor.pdfIn PDF document text
    • https://tivicom.vn/upload/files/mifudasik.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/94630156812.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/oc4e9fmmrg1hlel5uvq24jjqc5/wemenuwojisedepe.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/42204589160.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/karuxipoxiv.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/actfegdi72js12kvoh4l7m2nep/25603495701.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/watuvegoteli.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/65393511631.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/jowujalepo.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/xezubixiw.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/96356722668.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/70976299009.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614137a79661c---lusaneripisefelorofopeva.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d5d1b15df---lajujejejewotunub.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/xokogimezafuwot.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_off0000b871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB871 17116 bytes
SHA-256: 5bb3c0df72391f8609ae0a0e02bda36690e09366cb60a28a35bdcec1a7cfff93
font_01_sfnt_off0000e477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 11444 bytes
SHA-256: 5928ab088d3006fc6181d874789d3e6b443a544bb3066dfd20acc53636f3fc58
font_02_sfnt_off0000ff46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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