Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a88d6efb8d14ff…

MALICIOUS

PDF

83.8 KB Created: 2021-07-06 17:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6591a65a1ed04bb333a4495596569545 SHA-1: 56120bf00c2809ddb892a9483742f4cdda7b5043 SHA-256: 88a88d6efb8d14fff4ea022f877d2de800be849794dc6ea28d31a41ab8f8478f
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. The embedded URLs suggest a phishing or malware distribution scheme, leveraging these compromised sites to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/246676950b62a10135bbabb1cefec8b9/78141236455.pdf
    • http://megaprestige.ru/uploads/files/83566090794.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6b66772ff02532a939be5306c739d2fd/65281149757.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72dc6420c---96065077488.pdf
    • http://richfield1960.com/clients/865265/File/8617335105.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/36d0c9c37337ae7186e0016de25dda26/betipuveganafamuwe.pdf
    • http://prof-cosmetics.com/upload/files/sizesunajixiw.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba613ee238a---82461151177.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/5d4bfbdb2aaf096e65c1f1f70b9f2853/40735263907.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/d44f8a8dec0c13db5e666707a4bc0aee/lujurezumogur.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bed23097ac4---75759053230.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/t9j9vsl62oj2nua7vc8na7ibrh/xowaxexepekakapelur.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/9bc7b91cf282d5403a0cb46ac70714f5/85295471128.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daa99099cc.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085585aea265---80891240903.pdf
    • https://etimes.mn/uploads/files/vuvakizutolo.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096134916496---31277780107.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa2824a2d0---27806194001.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fbcfb974e---39727262134.pdf
    • http://alt-1c.ru/userfiles/file/nefivemuzasilidi.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/844568d1b3d72c5d54b37ab1f17c036f/zizazado.pdf
    • http://guides2alpes.fr/uploads/file/58985047910.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d7187a48ad9285a651e1c7a9500f0dff/sibadavoguxagutumuzoxexid.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/g036f34bk6i6jnt6unmgm3m576/wigok.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/c035cc82fb5063a8b922be5c3f705c9c/85025624901.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=during+a+chemical+reaction
    • 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_off0000e55c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 16792 bytes
font_01_sfnt_off0000fd6e.bin
c51db40bef4f69087c7c03a52127e2cbbc8215b6ef49f35f84f8601a06875cf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 16976 bytes
font_02_sfnt_off00012a02.bin
a8ee5ef635281e7b17edf64235d35b3fc12c840d0891680f43f2e332d40988d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A02 10612 bytes

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