Malicious PDF — malware analysis report

Static analysis result for SHA-256 a538ac2b244997c3…

MALICIOUS

PDF

92.6 KB Created: 2021-09-05 02:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a7f6580598357183c99eaf9714ac0c4 SHA-1: 3219063a36b2b07b831e603fdea2fc602a5ef91e SHA-256: a538ac2b244997c3d849c1c8c7707ca9d13808296661d2efb74a024f23ea1a36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of external links and the PDF_URI heuristic indicate an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://al-bandak.com/userfiles/file/vafugewijiwawizez.pdf In PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5531b93ada151057b3e3ee1442cc98d2/sagepofujono.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6de667fcfb---94004985046.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/1666613458.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/3a918c3949579bd37be81e97dc37a43d/tamanurif.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/eaf8oka18na20nee1c7jk13e37/47095464927.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/60230235743.pdfIn PDF document text
    • http://sam-global.info/files/file/sozoramige.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/93419078627.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/parerimosamo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc41b1064d---71179937071.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/pelufebaxaz.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/10045734670.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610840ac78cc3---34539640607.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/74cc13cb5277a1f4577b2d8c57f9e11c/61971634146.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/c688d8b542523135522d4c2b46d78c97/lufipujetigezuxujonireta.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160827611730d7---denopojadefajepod.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/marimejo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/roniwiwo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/c3f471rbem8pgnde0dsqvcdcr5/muvemonabev.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/18635056277.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/tubipugixugenu.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/41192687713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=non-neoplastic+diseases+of+the+head+and+neck+pdfPDF 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_off00010422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 10720 bytes
SHA-256: 461040be9ba505e4d65c5ad42730906a217d8bc8d72fe95c553bbddb081950d7
font_01_sfnt_off00011cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D1 18636 bytes
SHA-256: b8766bd6c9aeb35ec38b701eb4f28afded40025fdf808fdda1f4b2e49bd8b667

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