Malicious PDF — malware analysis report

Static analysis result for SHA-256 431a6678de09da2b…

MALICIOUS

PDF

93.4 KB Created: 2021-06-25 15:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f873311ecf8d5d64a735255907729e9b SHA-1: fffd2a9a3616134eb5109831f9600fda972dff87 SHA-256: 431a6678de09da2bf986cd33738cb6f1a57bc3cc80c948d28b57429005f071c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, acting as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing and trojan activity. While no scripts were directly extracted, the structure and URL patterns suggest a phishing lure designed to redirect users to malicious PDF hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0ef953e6d8e0a67d22875f55e0437db2/losijerurogoki.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/f6c9hk78fvm3o7magm5caui8b0/vawivasiredipezew.pdf
    • https://suksesunited.com/contents//files/rovilelu.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bc70f4216---muxinibafudiwapum.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2d1ae52abf951bf9c95010239045a34b/wagidevexu.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e60dc9b7fe---6639238471.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08dc4739d8---81012139147.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6d5aaf14---nezof.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/5346f8dffbce75fb4ade96fba05bb043/jebiludegazek.pdf
    • http://modellszerviz.hu/userfiles/file/juliposizaxenuzizoru.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32e4278a7c---18919026245.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/54k60jtatje4qjna48v7404ip5/81119298951.pdf
    • http://irths.com/upload_files/files/75361220355.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/ddf5953a034c0b9300289f19bcde1742/tuvokepogabojuvopuku.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9ed22b337---33744304133.pdf
    • http://best-infosystems.com/userfiles/file/66190632291.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=yip+man+and+bruce+lee
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f2.bin
784df4a790a965c6d15ad2e2c6885f8adf3414b1960f813a9f1116e728186ee9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 10512 bytes
font_01_sfnt_off0000ed7c.bin
8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 16060 bytes
font_02_sfnt_off0001028f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 16792 bytes
font_03_sfnt_off00011a9c.bin
58bd8bc7e3d47aa3deb6cccf6ee92b26646f6f5f6a3051b3bbd88402c1c60453
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9C 9744 bytes
font_04_sfnt_off0001395c.bin
0ab59e874723d14ad9c6ebfd7feb6de9a7b31576e7297cce6ad87c2e7063368b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1395C 19256 bytes