Malicious PDF — malware analysis report

Static analysis result for SHA-256 6453253404a25dc9…

MALICIOUS

PDF

123.0 KB Created: 2021-06-29 13:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d8a9704e5fc8af6f585161371aa87a0 SHA-1: 7b0a491af1ad7cfe0886d8e995fbc3e97e479e9c SHA-256: 6453253404a25dc924b3d5beea8c7f0398e32e784f205942137ea98ac674a954
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the nature of the links indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/3ea5351b5ca9a4052e263b414f9e845e/23751726021.pdf In PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e2f331789---kexovufozazowifakev.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/1at832s0ithhnb8qfdm846c20m/44522183280.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad230247981---rudikava.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/vikiju.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/wetesaxomaxevak.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/97485021197.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/97957070462.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2c2c8cb78---91209562609.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/1143530305.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/daiqros56btvf5034jvm6if5ma/50595723529.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/dfdc5c3d35a4402ca6ea72dd09d39cf8/xiroxefozopibe.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940d7172775---finewabipimafuditetobuwob.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607327a809ed2---91549422894.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b6b563dfce153c96b1fa2d879a21ee2c/72469072614.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d53895da358e74fb5166c20d2b3cdaf2/juxekuwajuxagudoja.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/dadebfe4039b204274190403d618774f/27836317149.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d73165972---boloxulezokidenujodav.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/91232065070.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c096307bad5---36739128504.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160980e32b9ca3---vofujez.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/7581886505.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609caeff3fd70---79195093108.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jgniqtd3ilhsbvnk5gbnl77r88/wivefibikusosipona.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/97190488838.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7c81baa92d074693acac5d548212590c/razosuxototewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=types+of+explanationPDF 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_off000182d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AEA 16792 bytes
SHA-256: 6b4a2bc3148a734b41d391d5659ce067d365387228e7b3ff57fcfb96560d7e98
font_02_sfnt_off0001c697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C697 10428 bytes
SHA-256: 472e01cc95855630344cb8929fe304031b564567f3ec8a2529ea25bbc6788283

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