Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d8acbd13734cd5…

MALICIOUS

PDF

100.1 KB Created: 2021-08-03 01:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f29edcda671c4768ccade0e340485fd SHA-1: 128c2a364c6f4099c051edcdbcdfbc191571c360 SHA-256: 48d8acbd13734cd522136fdf4f27257aff14e1bb265d3da420d22bc724d26a5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites and link farms, suggesting a phishing or SEO poisoning campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pistant.ru/uplcv?utm_term=how+to+get+free+gems+cooking+fever+2019
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764b9333c76---54270470590.pdf
    • https://dlt-nkp.com/fileupload//file/furexuzif.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160983ecc5fbae---disaxakejufanedaxademi.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/d8addf4aa06eeacad6cfdce6517e9376/refinux.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4e9884d2a---daxarebimegapedel.pdf
    • https://moyaexpresss.com/ckfinder/userfiles/files/21354038229.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/a4ea494b8eb5b37b650ee5affb6b4815/wimijuzajasexafiwara.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072449b0f99d---mukog.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/97c61efbd0eb0d31698fe725c4aa9f81/71666832441.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06d078bd6---warurugojapomaxe.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/6ed131136271317c7ecc378115d28acd/37531942198.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2a747a1e971675f411bbaa4a6400e97b/45993491661.pdf
    • http://castanienfamily.com/clients/74558/File/nuladu.pdf
    • https://borgopitti.it/userfiles/file/30937675541.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/e9eigtliqcasbdj8no07o2k234/vedeso.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae911d467---12716459519.pdf
    • http://bacsionline.net/userfiles/file/sazajipugotunidaviponawuj.pdf
    • http://podhoru.cz/userfiles/file/noxexedififumem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f743.bin
1cbace5747260006920b41375676f88a3a9e26c0b9d7fe0201890d5ad47137ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 11168 bytes
font_01_sfnt_off0001118a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1118A 16792 bytes
font_02_sfnt_off0001299c.bin
2ee641df63ba1ba2d896cba3436b6355a2f70a90846999532771df0805ce3cd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1299C 19040 bytes
font_03_sfnt_off00015ae1.bin
513c2fe750888190722b0f90f02fde926359268ac32fe091c6b8738723b933e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE1 29676 bytes