Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d652a5212ebda82…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 09:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f7e64ded7646ced015458b38cb1fa151 SHA-1: 53d641ee1990c5099763d862360dfb075cb9ee5d SHA-256: 9d652a5212ebda829c5453e7c1d32b106e8afe7a2625b05cde9c13466a81ad48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common technique for distributing phishing lures or redirecting users to exploit kits. The presence of ClamAV detection and ML classification as malicious further supports this assessment. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to trick the user into visiting compromised or malicious websites.

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://catamma.ru/uplcv?utm_term=five+night+at+freddy+1+apk+free+download PDF link annotation
    • https://classconnbio.com/img-jacson/files/20465583221.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/girofowozuxumelol.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/11552773318.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/utf4du2k80dns6kqehppqmtbm3/14134404042.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/riwotusokima.pdfIn PDF document text
    • http://www.f2dassociates.com/userfiles/file/19375771529.pdfIn PDF document text
    • http://lse.hu/userfiles/file/lukave.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/danawimedifipa.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/22424752547.pdfIn PDF document text
    • http://trubaopt.ru/content/file/14522277086.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1j2q1qm2g6n64ihnqrrdb1ns76/faluwugonivilokemebe.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0d21ab2f74d80e9ae147020ce9f1de49/81188227720.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/61863030202.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161339bd41a794---84075012934.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/jekezozexoxolitu.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/38075968487.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/rurezigokefozoremerosugo.pdfIn PDF document text
    • http://sushibelovo.ru/files/fifak.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614047055af4f---tuwafufutilif.pdfIn PDF document text
    • https://asken.as/bilder/file/48730569649.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/jomepusiwiboxivewo.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/24307808409.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/16624939237.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/40578319735.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_off0000b074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB074 15804 bytes
SHA-256: 4a06a9cd674d2043b902ed08d6a8d9425e5b77e57d31be1241203f8a73b885b0
font_01_sfnt_off0000d871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 10996 bytes
SHA-256: 83259d43ff832937a7a7be2341e910b717376beb95432732f085baa26ed2c517

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