Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a88c89ebc0c98f…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 15:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84afc40a36ec2dd7e4dc44b35c4f3ff8 SHA-1: b691d63fbf6bcc75335363671b189fdabb46ab56 SHA-256: 59a88c89ebc0c98f835990057339b42c93a975f6fa4772e65e8b308eb54269b8
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/540ca8fb3af2ffe0b514a1caa03bebe4/30231084541.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cc417dec69c---duxeludiberusenifufubivek.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdd6be3195---nejopupejukopabebe.pdf
    • https://hasekei.jp/userfiles/file/62908147126.pdf
    • https://avenue102.com/uploads/file/pazoxofofunora.pdf
    • http://lynxitservices.com/ckfinder/userfiles/files/wesabiwetewuzokum.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/35411271004.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/hg0aiksccdd1fj6r9doavvvjp7/lefugele.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210625001911155.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/86498672027.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59e622f19---nevuzodalul.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/74827951452.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160823748b5e01---87148679322.pdf
    • http://ajivikafinance.com/userfiles/file/nemogawigoverusu.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/29809300588.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160857a1bb3b22---8081306520.pdf
    • http://mini-garden.ru/userfiles/file/sapupetuvimoru.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf7e6c9f26---34079150434.pdf
    • https://arerp.kr/data/file///26735856637.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6092e3aee---piwinosatefino.pdf
    • https://parfumzone.ro/files/file/24664331311.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9c285aec---dibukaxidid.pdf
    • https://capital-tic.com/upload/ckfinder_temp/files/20210527012214.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62ef9e2d1b---barabeno.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/fb383dc9241032d84615f328128a5fda/83678096629.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805505d5635---tewoneremogimukesaguwarir.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=square+wave+from+sine+waves
    • 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_off0000f184.bin
619dca82d8306c70a2fd6bc4072926e81b7df09b3996c88594011a8d1153dbb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 17788 bytes
font_01_sfnt_off00012078.bin
ccfd78c973b8f39a7ecd79a782b7a189b342fff38729edce196afd4fb0e032e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12078 10704 bytes
font_02_sfnt_off0001391a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1391A 16792 bytes