Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4bda420b026ed5…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 15:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af776d556467f61b79922ec1436013c5 SHA-1: 4fb2734a7f1c6fbf9a86d769c35cf42fdcb28d06 SHA-256: ea4bda420b026ed550c65acd02e04f99fc06873e7ca3839b4d72609cded10317
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

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://airxps.com/userfiles/files/54449074385.pdf In PDF document text
    • https://zagi.hr/files/77259726076.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090512115573499.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f0e73ef10b17431d49f41a39d1defda2/21983684442.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b739a336bf---96175754220.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/suzurinajakavug.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/57249842763.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/dixafowute.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/6186594668.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/minifolu.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a3ab71a5c---voporezezukakediz.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/ponenavisupewezit.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/kijorisimiduda.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/kuzikuxedux.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/jigiwapivowifuduki.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/jefalole.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/ritabowefobaxidotokidisiz.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/42323852799.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/tawareti.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/vapamu.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/45737209767.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/zirufigaruputisiwizasuzad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+ui+design+basicsPDF 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_off0000d309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 19260 bytes
SHA-256: 86aa2842fc763194def026ed8fb729e23d91aa4fbc31cf4fd624f33e53a0fb0b
font_02_sfnt_off00011e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E20 10620 bytes
SHA-256: 656badf052b0b560eb7e885c93a012b9b8bdcfc141dd41bdeb044fb389243dc0