Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c59aa4c4ba9d2d0…

MALICIOUS

PDF

75.1 KB Created: 2021-06-29 01:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2934f9abcb119cd3d009e9750adfdd5f SHA-1: 7cbe7953e8136af239f2a0480eec4ae664945395 SHA-256: 0c59aa4c4ba9d2d07f7a7f75c496b541036742904c3c46bbc86c3cabf5902620
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and potentially disposable hosting sites. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=anger+management+for+dummies+pdf PDF link annotation
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609050afaec6c---zufozipoxikofilozo.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/lasofod.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c790c5c604---rixijulaluxuku.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16071736709621---diviferikezuxob.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/2t6atfd7fkr05m4ejm5ghpsip7/47153685962.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d0b2d5d42---xegexuxabolas.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160765f1de053b---zusave.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/vusalimeluzuzoxewu.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b184c4d9---mesikexikegerobotogilu.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/fibitokuwefago.pdfIn PDF document text
    • http://zae.me/datafiles/file/rinifuxazoriragafuk.pdfIn PDF document text
    • https://csodamalom.hu/files/files/wuwepuzefidorumezu.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/84726859065.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/56662982640.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/25ff98eceefd0215dd7572ec445758c4/fokur.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/97021073721.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/piriluvof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a314445e16---jowarikin.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/3056b659deaa55d2f448d366d250ef50/99917421919.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc5fee070e---83095129176.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf5ed45e05---9485959547.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/fudema.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/279952e2da2ed9e92ada9cdd6b6cf4d1/lojetalegogikexabilafa.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/xiwutemixete.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd3245537b---88299513678.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_off0000c25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 10876 bytes
SHA-256: 133702c73f2288b17e92dd401fae8f45d09857884e129f1dcbdc4030394d2059
font_02_sfnt_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 16612 bytes
SHA-256: 9b09488e0558638d3f27aaadfdc75c118879a911d2faba5f6c363484ecabf8c8

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