Malicious PDF — malware analysis report

Static analysis result for SHA-256 767ac4d83f8ab3b1…

MALICIOUS

PDF

83.2 KB Created: 2021-08-30 20:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89aa37ab99f679a96b1d655bc5a8ff99 SHA-1: e2010c58904a87d09494cd9509fc2792e1f3c59f SHA-256: 767ac4d83f8ab3b1e58178808522c36fdd6604eec13d9cd7c252704fe6d280cb
156 Risk Score

Malware Insights

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

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, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of multiple external URIs and compromised CMS upload links strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=this+is+the+end+jim+morrison+lyrics PDF link annotation
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4f3920954---88432163930.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/96306448665.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/56711506161.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbfd07274c---52706730881.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5ja93so5rl4cre6dubicnu3go3/37282961906.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/4gep6p4820a4q0qcljhdq6chr6/livoresojumij.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/sujidapemovelidulijana.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa6eab27a---17827550785.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57f9022c1---kezitetugo.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/39576103248.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/9ad1980ec7185480a06bf13f1153bbf6/56099324045.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/46878535826.pdfIn PDF document text
    • https://magnificenttreks.com/userfiles/file/dixevudite.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/pokuw.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/81d2c123842a508cbdd935c6494bd5fe/fiwoxadelipebemobu.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/7863090110.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/devosezuraje.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/gabowovovewojawili.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b9a7d2941a9bd11628bda375366cda99/xojifawegumopoteko.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/86377665544.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/94392435281.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/zuripu.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_off0000e27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27E 10680 bytes
SHA-256: cb9c404d4706a9191894fb1aa87c3d4d90faeaa7bb9acaea46e29aa27d63ca90
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 17356 bytes
SHA-256: da3a68614ad9f7ef70aab4f071b7fa842fbac696e532517694b05f02944cb4dc
font_02_sfnt_off00012777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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