Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f01bd527facb1a…

MALICIOUS

PDF

97.4 KB Created: 2021-06-30 01:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89e67dbd4b7d64f6614fa58aa5ede2ec SHA-1: 7976827803d8327ae776b278917f63d1ee8c7a01 SHA-256: b4f01bd527facb1a563080c81cd55a7b8595b0123b35f014a487d73102198283
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, including compromised WordPress uploads and disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dotacjedlaoze.pl/userfiles/file/36516677736.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a59dc58107---ketakowufiboromofedex.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/82ea83559ce4f8493b7d68cf71bb2239/nikisusupinufonukirogu.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/6596936dfdbc3fcab8924e882f9fcd64/vabufakifoxiwosowironivo.pdf
    • http://softtox.com/new/userfiles/file/41952079230.pdf
    • http://liubeauty.com/luutru/files/doxisiwa.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c858e0d9f---pitexew.pdf
    • http://citra.cl/userfiles/file/71288651551.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aa189f7b2---10558313480.pdf
    • http://batiment-tunisie.com/userfiles/file/xizenofolanulowalite.pdf
    • http://slsnn.ru/content/file/92666816718.pdf
    • http://legalinet.eu/userfiles/files/sedenuguwojijofunujen.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608471d4beb43---99371639341.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607303354bc2a---wufapowedujaxaxusurikorej.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c30e5921bc3---bemifagetilevakowomularij.pdf
    • http://casier-a-bouteilles.com/file/xuwubinipadezi.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609224dab573e---jitanaxopixaj.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/95126442943.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a775c4343dd---tadofivobagudol.pdf
    • http://rilta.net/userfiles/files/43333738329.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c4b8e9caf---lizunoxeji.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/betusutisogijegewopizeti.pdf
    • http://fanti-fitness.pl/uploads/assets/file/97086825228.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+are+the+different+types+of+strikes
    • 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_off00011958.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11958 16792 bytes
font_01_sfnt_off0001316f.bin
2c89dab4b2f75c301811a97112f1a7af82e3bc2d6b89a87e6f4854d53d01a453
pdf-font-stream PDF embedded font (sfnt) at offset 0x1316F 10748 bytes
font_02_sfnt_off00014a21.bin
2feb1ede1f7eb4d7549bcd91193a43cee9450eb5e7a4657d6a5fed2b8826f6f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A21 17488 bytes