Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee49c828852f28e9…

MALICIOUS

PDF

87.4 KB Created: 2021-09-06 15:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 845ce81854a81d1d1702ed179ab3abc6 SHA-1: 6c2ea135b0df56371cb59cd24c1a8244e49e3a09 SHA-256: ee49c828852f28e98304b67eb6d7f76aa5d65201a524ca81828fa12d33714d28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=teacher+performance+appraisal+form+pdf PDF link annotation
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad63b947a34---wekakuluzigaz.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160988a4f95127---62292403746.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/sonusonefoxataripesexar.pdfIn PDF document text
    • http://evansmedia.ca/userfiles/file/bomovasavawomudino.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/83923085893.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/zejunofuma.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/fojejikafodisotemat.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/28302863130.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/50621447987.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/48064157424.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/64378598292.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/denenegobudutedaxofu.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/zodiril.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/fekapegebasapawok.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915a48e6c63---83245421829.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/28086df215e15fdb0811826a60ad5d40/86667400213.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/fekelinupilatut.pdfIn PDF document text
    • http://ranch.pl/files/file/50844541795.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/39038057723.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/70712163516.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/jusukeriborijo.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/rabilanarogura.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/sodovavakuloperijole.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/fawibifuwawikiduk.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_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 17628 bytes
SHA-256: 0413f70989d5888cfcac113dc2564a224d5a5313d60ee42390064a7492b810a5
font_01_sfnt_off00011efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13713 10748 bytes
SHA-256: bafef45f35f4cfc764bc6ed5c5353ac3d7b96ad42e7019854de5468738edcff3