Malicious PDF — malware analysis report

Static analysis result for SHA-256 46cf8dc1d1990466…

MALICIOUS

PDF

71.1 KB Created: 2021-10-02 00:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b550ba8bb62f6e326752c4db85a3504 SHA-1: 8844db59f52e4a506a477757128bc52c80cf1eed SHA-256: 46cf8dc1d1990466bdd35a7f5e12730c73b9eceac9656dc53d2aaa3e482feb28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute phishing content or malware. The embedded URLs and link farm structure strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=scarica+youtube+per+android PDF link annotation
    • http://myucmas.com/userfiles/file/wakezomilobibomigevuv.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/gofovexodijilibetevebijal.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/55298572111.pdfIn PDF document text
    • http://www.polni.si/Images/files/wapajemowivofure.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/af642ec5709e69811c9c913a0c640afc/nexiwibivitigupedewok.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614b28a1aa3a5---20317748643.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/jufubobupinepu.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/78268108690.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/gifuwoxew.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/kudifada.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/vasudi.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/pefenixezad.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/85999998620.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366709d345f---55871807385.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/radeterononotekateb.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/80533872910.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/25545160879.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/23104646422.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/49332716105.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16156e974f29e9---45647206573.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/24232027574.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f58b4a4dc---verolediwekojawexizufu.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/75162051379.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/86853708612.pdfIn PDF document text
    • https://devismesport.fr/userfiles/file/41439412893.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_off0000b400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB400 10724 bytes
SHA-256: db6f9af4e327d04b815843c75881e2772320cfbdcff8d3276226a1ff605ed1b5
font_01_sfnt_off0000cc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC97 16284 bytes
SHA-256: 4a355f11c71be6ceeb41e3d893fdc59d71e7a30d09c024eae74a4c883bcc59ab
font_02_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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