Malicious PDF — malware analysis report

Static analysis result for SHA-256 95be0fd88d38944a…

MALICIOUS

PDF

105.8 KB Created: 2021-07-05 23:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b05ac0c0720e3c2946f5f17a189bf654 SHA-1: 3c3eafef477de13786c312348f9651f40de520e0 SHA-256: 95be0fd88d38944a565892cd4fa4a572e4a90e5ad1cd0dfb98c3f1bb4e083496
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified 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 various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users, potentially to phishing sites or to distribute further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://purofirstli.com/userfiles/files/54671183975.pdf In PDF document text
    • http://bartuceviri.com/userfiles/file/fibofovaxifedusa.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/f6d43133aed97ef92ef9226e75a29e78/ximufa.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/wezaruk.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/lumarudujoki.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba804a2221---89710104541.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/98661430557.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893ab8d518e---7263927662.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad13013e59f---wefozet.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/duwowulobawalakus.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccde407485---gujilesiderinadivelakixop.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/40708893885.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af793a6761f---9916535633.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ac4b057e---83466743964.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609461b0eaea0---84159358934.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/68020768172.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/mefifofedonet.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2b8c6446---nipojalegot.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/xafarupidafe.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b861q4s2kmvusenoorqeoqtp94/34798080974.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/gotuvezebifiva.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099841c9af99---dorolap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+happens+during+cytokinesis+in+plant+cellsPDF 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_off00013983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13983 11092 bytes
SHA-256: 6362ef7ba789e0a95d9958b6480da3543a91db54a8b107cbfdf3256ce61e4b18
font_01_sfnt_off00015323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15323 17116 bytes
SHA-256: 88129e5356cb79bed38001edff8209a3c67b771d6488f9445c1cde8b3d9fbf98
font_02_sfnt_off00017fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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