Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c52fbd5245bfa6…

MALICIOUS

PDF

91.2 KB Created: 2021-08-12 03:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c46ecdb3e945fd613ad5f8acee42319a SHA-1: 64edbd3b41955f1fc2166c8681333da0a0581d50 SHA-256: c1c52fbd5245bfa61a13fcd516d04a48c74761538f1cbd7abbf6e41e600aa166
236 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious. It employs social engineering tactics, specifically a 'ClickFix' lure, by instructing the user to copy and paste content into a terminal. This action is intended to bypass macro restrictions and likely facilitate the download and execution of a secondary payload from one of the numerous embedded URLs, many of which point to compromised CMS upload directories.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 https://tutorsbureau.net/userfiles/file/bekaririwimov.pdf In PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ho3bhfb8b83nr0ivom9lvh3h4h/voxezarerulezelatolagiduw.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5qvvvrieco90dijblbpqjlrr54/9587129975.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaaff16cbc---87994374542.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2cnba2nepkrh88u1flksgh3jb7/jijefo.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/zepalatiwixibejije.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/menopuwaxoveliredurekenab.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/serisu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160898aa155ae2---zevigezekegiluniga.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/dovarobiximiwepoputorob.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/86708103808.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/97754336282.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e868a14fb9f---gadapevisamur.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160895b28cb86a---63786358977.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/075bbb00a8d127e704c337638b7cb09c/94232201636.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e12285fbbfcd821283acc0dbb4f47064/66423920897.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7c0vbnicj3dp1rbffc3q12ijq3/wegovudexomiponinotuxu.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/zilomapuxusegafa.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/o37f278h94mer9qci00jmruuve/14648422808.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/57984130715.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3acddeca3---58622905972.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/62459512918.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/28431007305.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161044c4552fb1---mafowuxulorotosomujave.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/31888858893.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/putedomojezakubipir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+mods+on+ps4+minecraft+2021PDF 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_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 17392 bytes
SHA-256: fd998628c055d97cbd01d3d6504fc6f852a00a4305f668cab770a84bb68b9d0c
font_02_sfnt_off00014406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14406 11368 bytes
SHA-256: d7862b9353571ad85970c18990cc1ff8bab6a7d4db147c8636907f176ac0c760

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