Malicious PDF — malware analysis report

Static analysis result for SHA-256 065f4ffd8b7c9854…

MALICIOUS

PDF

86.9 KB Created: 2021-08-03 00:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbfb3135919ce4b40c48eb28e7dc9b00 SHA-1: bf5043f424041d67af40758ae2228bf57be60178 SHA-256: 065f4ffd8b7c9854bb6563e0392cd0dd6f143d6b49d799beeddbd33fcb39d759
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that likely lead to malicious content or phishing sites. The presence of compromised CMS upload links and disposable hosting further indicates a malicious intent to distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://ketchas.ru/uplcv?utm_term=free+printable+bi-weekly+budget+worksheet PDF link annotation
    • http://www.heksan.com.pl/file/34927696765.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/2106190859537543124o4ky.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/wuzujipawezas.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/38f2c8c937b7d168a5ef0edb387f178b/76183565889.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/xisowere.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848dd16bc1b---60246612924.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210610_1A37AC7977CA41A3.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/lomavikureg.pdfIn PDF document text
    • https://soechi.com/userfiles/file/25866706620.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/7141173022.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5e7ce8d6d---13967515424.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/diluletikumi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083db9a76ea3---pinemivi.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/robifo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0350805f94---gutowulibevasumurojanav.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/daleninilotakuzedaweru.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/8123116882.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/b19q772295ahp11ahbse8uce44/27297125704.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/jivofekumafabo.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ojf3m0cjtqt4tn7dsgv3s3tlr3/redenolovofalofogevifota.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4202ebee26---wiwofulilimexibigobu.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/344iema91olel7rvlcnl5a5m5d/faxalakenuri.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/jru6aaig766m96plspimf4j9im/voxaruwa.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_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 11216 bytes
SHA-256: 733cef3c3f347587e732a5f639e471a904872056268d34ddd1f742844c35a82d
font_01_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 16796 bytes
SHA-256: d7e3197e668c04fba4da1503d476735b215316d5466fdaeae3ff6e8e53a8ebdb
font_02_sfnt_off0001345a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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