Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c448db6d4c81683…

MALICIOUS

PDF

94.9 KB Created: 2021-07-07 17:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b5c019d11488346de2391fd0a173804 SHA-1: 0ab31cddd7f77ad119a42da47184d142fcf28507 SHA-256: 9c448db6d4c81683edbf6bdb82a472fadc370c5f1cfe50d3a4d6a1ee3744eb01
204 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The presence of a 'password-protected archive lure' heuristic suggests the document is designed to trick users into downloading an encrypted payload, likely to evade security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=crack+password+protected+pdf+file+online
    • http://budoprojekt.eu/obrazy/file/88855536986.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ddc302e3a334eea9885b3516bfdb9eaf/61719026009.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c47a20c60ca---87813614161.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085e06a50bd5---67918411489.pdf
    • http://auxerretv.com/content/public/file/52031703836.pdf
    • http://amdind.com/userfiles/file/rigumatapivide.pdf
    • http://cupta.org/userfiles/files/20210605132254.pdf
    • http://harchovyk.com/userfiles/file/84075378903.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/b1de40296b7f03e70457a204787bbd01/takogum.pdf
    • https://uleshuzataruhaz.hu/files/file/lidojumamedojefobatetuje.pdf
    • https://bobecoingatlan.com/uploads/editor/file/42105152558.pdf
    • http://www.jindatunnel.com/up_files/file/wibafegovosefe.pdf
    • http://zonazero.es/userfiles/file/dejixasoxuxi.pdf
    • http://classicalgardenornaments.com/uplds/file/2054791212.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/j258uv9k22kc3gs0odq6c4p2pq/rosoxonigunamozo.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b89e69af2bcd6e6748c81a80c99c742a/xabevo.pdf
    • http://parkhigh65.com/clients/4970/File/lufizepamimexuvi.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff2ad24988---zoganozikarol.pdf
    • http://irollee.com/userfiles/file/10572537946.pdf
    • http://technology-mp.it/userfiles/files/wofopov.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/9b4f016ad00e1b672f5183775e0745fd/26211877628.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/b74cb3ae55bb015a7192be3b24300987/tajowajijibabaturuta.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/9208c0a888a3c45076fdc66b636d1df9/gimifarelirufaderoxufela.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/cc0f10cde7ebbc279bc00bce9b703226/gexadigujemowuxipifive.pdf
    • http://hnsunnyfood.com/d/files/1770399867.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_off00011020.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11020 16792 bytes
font_01_sfnt_off00012832.bin
696f0c272ade02c8e41ec8324f05fea0fd7984a95769e11b026db90f440c94c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12832 17396 bytes
font_02_sfnt_off0001551b.bin
5cb982afd50bd50ba6fb999dddf1cd22174c5abcf23299425dfb0a6f082138c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1551B 10824 bytes

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