Malicious PDF — malware analysis report

Static analysis result for SHA-256 701a6c13b360b73b…

MALICIOUS

PDF

88.6 KB Created: 2021-07-23 02:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9e90022d498a5687a5adfa62eb047e60 SHA-1: 8bdb645a1397c71b6bcf01a2cf29c9f458da0ce0 SHA-256: 701a6c13b360b73b02bfbe87856fcc55558d6fa0db7bac03f09d6b9d4eb510c2
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/13c15989131a5ff204c2b88997627f1c/jenuxiwobavasawaxedogitog.pdf In PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/8dea2499d7f2cc90dd977f0434152340/sigemoxisawifaweweve.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nnh8ogs9giccs76ujjvq7v56d0/32607973687.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/eeb4c552ce341b9598d504c88add0f57/mimekoxatodanofef.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/xejativadigenawifulezo.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/153721039ce5fe3b1eb34408add4625e/62381160600.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d35c45527f1---jogani.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac136e6d6a8---35357665745.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/kipaxololipev.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/653a9a29082b77ce5b44757246239f37/21795592925.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a182b83678---93961794210.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60f88d2fad---mimugasamamukasoz.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/80027388727.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/zijob.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81dd27888f---xegagifokakamoz.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/44877374587.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d0hbm23s4v3cq6um4iqpg75ic4/18743499983.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c23692eb69e83b3953af57694148d7be/78594586730.pdfIn PDF document text
    • http://bwc.lt/i/nafox.pdfIn PDF document text
    • https://aplussoap.com/upload/ckfinder_temp/files/20210706204338.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/1844949043.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/43871766795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+wolf+and+dog+development+centrePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 10920 bytes
SHA-256: 4321180f3fbf5dc6f170ddf33ceb757b61b7e323a1b86f5070a8deba370f6cc9
font_01_sfnt_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 17248 bytes
SHA-256: 68a8195a6aa4e5892a3e0dc515a7b50083ef0c82aaf7ee2e58dfbc1537a4a5f8
font_02_sfnt_off00013a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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