Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f11cbbe06349e81…

MALICIOUS

PDF

127.4 KB Created: 2021-08-08 13:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 8182d48e2ea1a73501583391e5c20a3c SHA-1: d8f5c5a39f2c3c7e6f2255f07aa7f00db39741ab SHA-256: 6f11cbbe06349e81aa76a6ef82fcb86ec67341a6ff7322df0ec55ce62cab9f3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a deceptive purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://investbuild.ru/var/upload/file/zesuweniwawalili.pdf In PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/53b0ecc926470827b81bf405effcc70e/renozezawega.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/15538145665.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d1fecc8cb---toluraz.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e7fe19c74b---lavoromovizopezugolope.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/vitobobireb.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/wabegurenitede.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0d9d85009a4abe8312b218a81b26f493/runozisezezowewa.pdfIn PDF document text
    • https://bursac.net/userfiles/file/benamadisamerokutew.pdfIn PDF document text
    • https://virker-ikke.dk/files/66373840982.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/24398923090.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0815a83c9---96996470814.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/99387518792.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc5c817d14---34125686166.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c8847afb2---wereziril.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a685e8b9c29---2302827162.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/pefobep.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202107081750385109.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3ea5cb013---golalivawu.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/wawewevot.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/53343797010.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104e5fd0d0af---72769492035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=practical+statistics+for+data+scientists+2020+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18452 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_01_sfnt_off00018c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C56 18224 bytes
SHA-256: 65a6b25ef7cfda330b7f17d86e6fac2e507ba154d01232d1502422592db55d56
font_02_sfnt_off0001bbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001d416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D416 10856 bytes
SHA-256: af62d6054a9b959374b64d9abc2cf4f9f27f23a43383d4edd4f8b1bdc5bfe71c

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