Malicious PDF — malware analysis report

Static analysis result for SHA-256 5853061c06dad5b3…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 14:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a211444aa0233f77fab1dbfdc7647979 SHA-1: c75fb7a68fce68c2a68919cfd8de7cd4e7901d08 SHA-256: 5853061c06dad5b3e1c30017304890a3fedadd7791a325c0c7edd0f8d49ba9d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting, likely to distribute phishing content or malware. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites.

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://garglob.ru/uplcv?utm_term=nothing+gold+can+stay+quiz+pdf PDF link annotation
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610a559069905---67294103465.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/57908952492.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/33567326228.pdfIn PDF document text
    • http://limoride.net/gallery/file/91533633384.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6fb219be8---zufibuwiwe.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/41741765231.pdfIn PDF document text
    • http://famillespourstarlight.org/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/bagoniraxixasowoleg.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/1232573723.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/31398865578.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160de1dec4c859---gifazane.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac79ab5bda7---zakotomuzakaxawozoxif.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/kunurimurafubufegu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8153366d06---bebuzufebutodek.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c691d356878---wafidixexenerujagizujam.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1610a4fc4e91a4---vosemozum.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c3e1e3393---gewubuna.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/rofarimute.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/wogikesap.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/rulumij.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/siwabulepexi.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdda9f3394---ragejinamagekedo.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/79b214afba7c96088eee7bd859489a35/32793503208.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/12833680224.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/83822101383.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_off0000bea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA2 11064 bytes
SHA-256: d8ef7101165d47de1ea44bf0fd62248a4b673461af413bdd728391a0f44b8bad
font_01_sfnt_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 17876 bytes
SHA-256: daf7ac955581cd8a57e332a1811ff90502afacf4daac868ab0153499a5644257
font_02_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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