Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa875551e1ba58a8…

MALICIOUS

PDF

87.1 KB Created: 2021-09-01 14:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5119016f56c8839991e5a6a4a2ae5887 SHA-1: 321e0b1b19275f9a681da75c455b9bbf5cc8415a SHA-256: aa875551e1ba58a850f57421336cdf2bfa95b7a6eb2dc0f845d367abb2211bdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=formal+report+parts PDF link annotation
    • http://aryajob.com/user_upload/file/lutakojezeripadozufebiti.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/bq4g3bu8pulouimg8fc0ddfjl0/safiki.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/xijenopilal.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/99701467298.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/53930292130.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160945f89dc8c7---26330158719.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/50327703362.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/7837348042.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/61539235836.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/63479035352.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/23986466223.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9dbb1a313---83730744290.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/tamab.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/58296934147.pdfIn PDF document text
    • https://angkagenap.com/contents//files/58371810755.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/kugumebume.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/xomaganugefenigizo.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/wafemototuzezewo.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160742691d2bf7---xefezemiwawev.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/59135961268.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/38854415972.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/titarububelu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607797c4441aa---losinogafasaxowataradum.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/1ff8a2cc1efd741e9eeb07880960656d/nuzoxurikoribo.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/90b0e5af58bcc86d31c6c588c533cc83/nesujigog.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_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 17996 bytes
SHA-256: 2d3e4c71b6a770f2a59525511cb8015670a7ba75c50dda3bee16f91502b74f84
font_02_sfnt_off00013746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13746 10196 bytes
SHA-256: f2eb0abe7b18bf491ff121557e76f63e68ab68506a881e740ae1564e9225cfaf

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