Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8a5814f6794b85…

MALICIOUS

PDF

92.0 KB Created: 2021-07-02 01:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a7c371757fe292430692b0454004320 SHA-1: b30807238cbe634db6b868531befdb4a627ce999 SHA-256: 8f8a5814f6794b8512ae9d81e723231767ff8c19f149618fd6aaf9281931c7a0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm to distribute malicious content. The presence of external URIs and link farm characteristics points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=do+you+need+cellular+data+to+text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/balerogeramapalolaxe.pdf
    • http://agendaalzheimer.org/files/galeria/files/20299685575.pdf
    • https://aawyx.com/sites/default/imageuser/file/40105710496.pdf
    • https://cardion.dk/gfx/fckimages/file/zemega.pdf
    • https://amitadevnani.com/userfiles/file/17796580249.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/3oj97v2pu95gbdv23g2mitdup2/dezalebibada.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/56181539360.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/7f0d9f651e1b26e3e81972993cbe5602/54902591590.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c8f303eca---42192758648.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608164e9dba2c---ribozorokutazijodus.pdf
    • http://hgbs.de/userfiles/file/julofexalonamudokixi.pdf
    • http://skyfestival.kr/ckfinder/userfiles/files/zowir.pdf
    • https://anandamsanyal.com/userfiles/file/8313276523.pdf
    • http://ahkkpcm.org/userfiles/45401993007.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/0cef0e0ed32d026b8af7650512f873a5/bevidisufomifupexebodomi.pdf
    • http://aitrans.cn/UploadFile/file/F1202106210507403682.pdf
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/34543371980.pdf
    • http://gorisum.net/fckeditor/upload_file/file/5490135316.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/11e5a09d0a0becee3aa68864e640bbbd/womigimogiratesaxotol.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/qvpdu3r9d69andqlneadi29e41/55635256832.pdf
    • http://chickenwild.com/upload/contents/images/images/rududelarumirinina.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6bc7a140---18053144861.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b82e9dc587a8b7de42af9c43641b62e8/70128183949.pdf
    • http://cp-tournament.org/ckfinder/userfiles/files/96696158366.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_off0000ff30.bin
bd462fa14e6943ac6e11f9d72d985e70bb147829589fe04fb5ee982f5f41d979
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 20016 bytes
font_01_sfnt_off00013300.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13300 16792 bytes
font_02_sfnt_off00014b17.bin
2efa2bb9ba671e0c2018022a96d6b5aa888d56f0587a3666fddfc99b8a1ad54f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B17 10420 bytes