Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19113cbcfab130f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 21:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f252d9040ba0ed45a4d1cbc33d411229 SHA-1: 055dbd85c69c33fa5dda9091f781e957b7c1e723 SHA-256: d19113cbcfab130f59209e3a8fa7941d49b467586a85de5ce4ad17f6de85d050
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF-specific heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=bobcat+forestry+mulcher+manual PDF link annotation
    • http://stattus.com/assets/file/21164866942.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/uf1rnpnio4iamgb5oajkreifo2/dunevogotojodepasedaxidor.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/bifusutafafaxasizulodosa.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/kezuwirojuworuviv.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/bekija.pdfIn PDF document text
    • http://vce34.ru/attachments/file/koxovopogeteraduvawulaneb.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a01937242e---55092683733.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/terileruxorobunolilutupew.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/99195562315.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/9f232feece7a6a33463aae0e8b824e43/mizafopodosewuwepurikodef.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf4cd90675---9693537900.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/9016513378.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/59f088d2ac9b89cd3bb284aaa8c82c8e/38048447048.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/22575755637.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/74650706552.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/21203559912.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c9f391b0f---52089312761.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e8da82ec5---kezones.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/82c6f6977f7b55a59d8cac7ede8addfc/93048788106.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/medix.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/tuvudiz.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086837dbb933---15627228998.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/fagiteretov.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-7-7/20210707200638693353.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_off0000da28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 10916 bytes
SHA-256: e92c17d1cfebb89a4b7bfe096718c725b3cc94eefda1793ccad16ed63fc4f8d9
font_02_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 17728 bytes
SHA-256: fea082313925e77f9426fcf99bcb2b5014874d1d75694a7b376bc64ea4b41467

Open this report in the interactive analyzer, or submit your own file for analysis.