Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5c4afba002da65…

MALICIOUS

PDF

85.1 KB Created: 2021-06-26 17:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d7055874f8bf494b9c5881559a85741 SHA-1: 269a2e2fc477ab9cca3d96adf94dd50cbec86911 SHA-256: 9b5c4afba002da6534f8e13c60dc1054a851b642d5adcbef2ea0b25c63e22acf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress uploads and other external sites, suggesting a phishing or malware distribution vector. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://philabc.ru/uplcv?utm_term=license+plate+agency+spring+lake+nc
    • http://agiusfuneraldirectors.com/files/file/vogibigesulavejarorez.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b300c435c76---65237437086.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/820efaa98fc4e3b5c1807b0fdd1c427d/63119530147.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160937e9f2e78c---jisusomovusirabapujaxix.pdf
    • http://unseretochter.com/images/file/danuxupi.pdf
    • http://ristorantebiscione.com/userfiles/files/51254840040.pdf
    • http://recrute.fr/files/files/63236043589.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/xekobadejati.pdf
    • http://dragoniresorts.com/userfiles/50201648396.pdf
    • https://vettercycles.ch/userfiles/files/78731972864.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/891d6e8a28f8d44075dde0a4e5b29193/23327053898.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67954b350---7566891568.pdf
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/sunavoguzi.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/9b772c2bd9fe23c57c064cc5afecac68/2482306864.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bba3d7bb838---tagosi.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/rv4d3ge82vsi9ioi1f4hoinpet/wobuzomiboponizemivuko.pdf
    • https://emmaushuis.org/pages/lomuvogolewoja.pdf
    • https://anfauglir.com/images/file/sazejawinoxabozo.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b16a04522c---nijovalu.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0c35d7cbdf149a66642619a36381a5f3/72086755832.pdf
    • http://massimoandyuethui.com/clients/69227/File/78999947062.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a42e524ef10---seniwabu.pdf
    • http://www.jindatunnel.com/up_files/file/sexapalavetiwufariv.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832bc4d117f---10383947483.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e33a2ff1f---27486621552.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0691cc603---78199977618.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9cd.bin
0b307929de2e0aff7eddec05df8052e4b3166e85fb3837a86bdfc1b2391e5341
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 10592 bytes
font_01_sfnt_off00010225.bin
a0eb45695d952bd6eafbfb1ab6126df50c8cd030b4fcbc857399c0cc986e7679
pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 17176 bytes
font_02_sfnt_off00012ebe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBE 16792 bytes