Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bc47a6918e9404…

MALICIOUS

PDF

121.6 KB Created: 2021-08-14 16:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cbed5581ab83b121988950fe47e28088 SHA-1: 5f0405c42d7e1fe10e31c936bd7ceeac33e901f1 SHA-256: 21bc47a6918e9404b0291ab8b1fff10e915dc00ad3de7426d4938f15ea25a7d7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised WordPress installations. The presence of these links suggests an intent to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://catamma.ru/uplcv?utm_term=best+cream+for+dark+sunken+eyes PDF link annotation
    • http://haai.org/upload/file/gidabugomize.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5ehf36u8ppbm47eoi1a3h8loe3/lujilugaxirotul.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/brv40b5134gp8vqan9j8vdr99u/16467632950.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/77580744696.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/bewupedabaveja.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7891ee3faba788fbb6f249d9722a176d/nenet.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/4300261159.pdfIn PDF document text
    • http://remobudostol.pl/pliki/leluxoxit.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/gibomezi.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/82065128626.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5da835f7d5---85892059638.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799f51d5bea---81255735389.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4ee3dbe8f---17422848638.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/98ea135db8df00ae5feaef218f376312/nijaxarewusi.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/74665541485.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/nebapivixogesufinuxis.pdfIn PDF document text
    • https://foulardfotografando.it/file/deseguzukutejiw.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/f16aaf582d90b1b0fee1d0f6bb6295f2/64593207940.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ffa13fdb6df6e0cfc0fc925e6b04127e/94047280550.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/65394394907.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1434bd2ba---49256831916.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/52824332182.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_off00017a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19286 10856 bytes
SHA-256: 97fdf2742a85e55f6fbfa93bf32db2b82a4d3d1d757a3c4f5257d0ebb62176a6
font_02_sfnt_off0001abb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABB6 17392 bytes
SHA-256: fd812a883b8b6f33b79fc727449f8e886f7505a5139f605767670003f871393d

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