Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3d2d0fcd2db040…

MALICIOUS

PDF

80.7 KB Created: 2021-09-22 21:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e925bf16b3f92d5e18fa47cdbb586a0a SHA-1: d5f81b3f1f27d1c26b754e917a4a3da571c633c4 SHA-256: 9e3d2d0fcd2db040ed4610929b544a603184b37e8d0442ad261558ea52c59d2d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

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://archism.ru/uplcv?utm_term=turn+off+voice+assistant+on+android+phone PDF link annotation
    • http://adasbruiloften.nl/userfiles/file/rivuna.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/89742931654.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/45989146366.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/46503398276.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/91f31eba60e9fe7d33f6e506fffa1414/38506668729.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/14282893780.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/71107738834.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/11726106241.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef28ac89b2---7025803347.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/31309625882.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/zijozemodekilurujedanagu.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/89230603449.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614046a3a12ed---vosogufog.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613104cae548e---pivekired.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/kevuni.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b66d2d27b0d98f5721e655dcfc79fd4b/kagujezafi.pdfIn PDF document text
    • http://dakov.hu/_user/file/92004932928.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/vifepapovuresaj.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/36368674663.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614140214af4a---banoka.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161406f213545d---17847907940.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/goxamilakotaje.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210913105126.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/48730023272.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/kizel.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_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 10800 bytes
SHA-256: ee150d36f76d8e2186089f68883a5f5c00952194fb11480259c3fb8d49e97aa1
font_01_sfnt_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 17368 bytes
SHA-256: 539503c7260c4f267e2ccedc2f53c748d2bab8d93bf21447caa51f9c0fe8b0b0
font_02_sfnt_off00011c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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