Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c3d7eb3c69f7df…

MALICIOUS

PDF

87.2 KB Created: 2021-08-06 12:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 465e7bc4e18ed2c43bc1e66fda49fab4 SHA-1: 947489488606d0a8cc222444d58db63820538f4d SHA-256: b0c3d7eb3c69f7dfc5e13d66fd20292319baae567a9a7e81406754f502a06320
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates that the document likely attempts to trick the user into running a command, a common social engineering tactic. While no scripts were explicitly extracted, the presence of numerous links to potentially compromised WordPress sites suggests a phishing or credential harvesting attempt, possibly leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160727ff09affc---18136016489.pdf In PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/85220209065.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608503825f3b1---kalekegavivijokulopi.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/fetulagafezixokogixilum.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/b9bedef6b116e5f90c4da15f5193027d/sepinez.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/91v6ii6cb93t8urrq7tttnjjii/kobuxuribaxelun.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a792365a3a36f41f4b6e9c3c78a19395/jowanivalam.pdfIn PDF document text
    • https://masihpt2.com/contents//files/gewiza.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b851e4a64b3---26821503007.pdfIn PDF document text
    • https://gangnampools.com/contents//files/77435700630.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e5e894eed---gizabu.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/pesunowuzojogoranenipamug.pdfIn PDF document text
    • http://baudoinfamily.com/clients/f/fc/fc66627f90e8a365851b026dcf169025/File/rabilibuvarifu.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/xokegekilevowusizuja.pdfIn PDF document text
    • http://3q1p.com/upload/file/210622094250892627yrszz7sfbyg7.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/kelojerotujomezivaxi.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/keu1nb4vni6j2rfmnk7saqfops/vabibalememikibagowu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161074e7ba6808---76754259510.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e1034a381---regogesiwadexewuwokav.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109291852df8---ludonasaf.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210715232200.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f0e178ded137dab0ab7e6ebd2f33e91d/41925502516.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/095c00981fca56f7aa935e46460f102d/55053598302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=communicating+at+work+12th+edition+pdf+free+downloadPDF 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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 17072 bytes
SHA-256: a346493d56658d0f6750f0ca0b9a23603511cdffd1ef73c5b0a2a77f76a34f5b
font_02_sfnt_off00013446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13446 11380 bytes
SHA-256: a0c6c9d91cd4903550d9d26cf9d564c069aaeb8b9f58176983f40b114718eb4a

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