Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fecaa09085069a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 16:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dfba1e8bccf9b964a3b443760aa3ba94 SHA-1: 4beaec38663ad5c70cbbeeed0d694e5de74459f1 SHA-256: e8fecaa09085069a846aa6f144ba62b533684a983aeea0eab997ef9522e5e05a
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 CMS uploads or disposable domains, suggesting a phishing or credential harvesting campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing lure, likely using embedded JavaScript to facilitate redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crysiq.ru/uplcv?utm_term=the+book+of+the+dead+summary+pdf PDF link annotation
    • https://nls.vn/upload/files/62687190840.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/migulekom.pdfIn PDF document text
    • https://yodobashi-church.com/13179131001.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/jefesoweg.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/46530800664.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/lovatoxubidimew.pdfIn PDF document text
    • https://veneziashowroom.ro/app/webroot/files/userfiles/files/6199569602.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137e06e243ce---87076070055.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/36921760271.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/11221723821.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/97610438217.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/juzediwofugo.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161395096b440c---64438700900.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/xubafanejiruvoboboluxuwej.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b2f16dde3---geliki.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6c17041ee---86582952709.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/49709881237.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/ragibuvizasozinud.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/birozug.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_off0000dc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 17984 bytes
SHA-256: aa6b4e2b7d3d3457aba6a879347fd9038c0bb06982f6117bd1d72541e54a3531
font_01_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 10932 bytes
SHA-256: a24f4ea6bb61eea59576c421c2056d083981f5fd829f3b9e06650374faaa3ee1
font_02_sfnt_off000124ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1