Malicious PDF — malware analysis report

Static analysis result for SHA-256 46edcd2f21bedcba…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 09:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b5e648ff1dae19dc5590a30e9a4e9dc SHA-1: 3f89c04aa5d7caf4dbc6fca8c33218568a54c29d SHA-256: 46edcd2f21bedcba1648ea980b098921f1feb50bcbde35616e89a599f81ac07c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to disposable domains or compromised CMS upload storage, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

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://maconlux.ovh/userfiles/files/jodusubulagerir.pdf In PDF document text
    • https://iuoshili.com/upload/users/files/1623173264.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/mewakowugaxuvobumof.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/fujinikadevexaw.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210910_9BADAD9E2733C5E1.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/gesugirob.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/xafedaxox.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16141a5c0dbb98---valuri.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210902000253.pdfIn PDF document text
    • http://elitvorota.ru/f/file/bifuza.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/90601493913.pdfIn PDF document text
    • https://miet.hu/kepek/73909634779.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/zadefajipizunuvosaveku.pdfIn PDF document text
    • https://basisangka.com/contents/files/51921841978.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/20018101617.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613643087e42d---wegijetuf.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/bepomigeviroxur.pdfIn PDF document text
    • http://asid.rw/userfiles/file/72685482.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc0de60254---27456560707.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/56311493120.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/e7f2ac6444feb4691bb6f8ddd3e4cbbe/jogida.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/76115087170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cms+android+appPDF 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_off0000cdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 10308 bytes
SHA-256: 89037b3deef838db0c9bf9af74c13acf865615f7fdc2cedceee010a46038e45f
font_01_sfnt_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 17816 bytes
SHA-256: c57eae204f4307977751ac87a3ab43725f48d9e1a2a49a8bac4933679f9fd9c8