Malicious PDF — malware analysis report

Static analysis result for SHA-256 6063a07db5351379…

MALICIOUS

PDF

82.6 KB Created: 2021-10-08 07:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9acfbc0763793f53971e06ddd7ef1cfc SHA-1: c3fd3dacf06363441c7fd71ef5c66a254f71750a SHA-256: 6063a07db535137922b22bce3b7e6d2c7f0722406fd88859c96d191c7849f26d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other hosting, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://archism.ru/uplcv?utm_term=9+month+old+teething
    • http://conditum.nl/userfiles/file/japarugadixalitogaj.pdf
    • http://gibisch.com/files/files/jojobuxogewafobovuzo.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615061acb8ca3---xisajujes.pdf
    • http://aranykoronakft.hu/userfiles/file/nexawigibixutekej.pdf
    • https://baoholaodong24.com/userfiles/file/gokigadabetipetoxomidu.pdf
    • http://liluby.com/upload/file/42552461214.pdf
    • http://gachbinhduong.com/upload/file/luxedobivazivenoz.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161341af8900aa---67809703990.pdf
    • http://compsult.net/userfiles/file/tagoxo.pdf
    • http://vietnam-intraco.com/webroot/img/files/dosera.pdf
    • http://www.pes.edu.mn/ckfinder/userfiles/files/69970917867.pdf
    • https://patoman.ro/ckfinder/userfiles/files/97718468350.pdf
    • http://custom-mugs-factory.com/uploadfile/files/55814802057.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6da165bef8d98d7b14f25bf5a784a912/72839291557.pdf
    • http://tomboy2.com/images/library/File/51590461597.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614df2db9a79d---roneb.pdf
    • https://dpengineers.info/admin/userfiles/file/78034310148.pdf
    • https://legend-chang.com/UserFiles/files/90307342841.pdf
    • http://zdrowejaja.com/Upload/file/82576827857.pdf
    • https://gastriklandsbf.se/UserFiles/files/75557882816.pdf
    • http://nemeckystrakac.sk/editor_uploads/files/27964699494.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615a5228a6552---lixapabixovikepalepet.pdf
    • http://skupka23.ru/upload/m/4815357201.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_off0000dceb.bin
886cfceea9a3f4e41a21a2bb494de0871b012f0e5851c04e431c0416e1614325		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 10336 bytes
font_01_sfnt_off0000f3b8.bin
2ea333c4b0ad9b78b6dc93021d3b95035f7b20bd3b43b774296078dd1c84718d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 19432 bytes
font_02_sfnt_off00012510.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 16792 bytes

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