Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d5d23c43a1d807…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 07:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 421752c473008ee33b050c687dcb0714 SHA-1: 4c3de9673b40ec1ee80cc0519d789f74166081ad SHA-256: d9d5d23c43a1d807a38d3747ab06c266eae922b4a181f5346cf01d26d81fdfb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to create a link farm on potentially compromised infrastructure. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF, likely serving as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/uplcv?utm_term=salary+sheet+format+in+excel+download PDF link annotation
    • http://m3hotels.com/userfiles/file/49846645700.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d10480fb---rozit.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/93494156693.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/j9dkf3bn9s5ucjc6af2d617pt8/58735203985.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ud7h2f7q57ebr7b6t7e4uk3o29/toberobuxixiv.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/23923223423.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f47fab951---20296209351.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/pazuxegaviparezupovusamo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51fd77f43---98470545580.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/11cd92af693213b7e4b665c0922bb8c8/wopatinasitujidepaf.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f92d9e484d3b72cf671dd4aca7d70182/tukabide.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/vososefabo.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/10912070747.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/tpnknkrt1qr2grlfvqclccub4r/70734338238.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d380d555b93b8c9e0ff08811468575ea/lanuri.pdfIn PDF document text
    • https://partnermind.cz/images/files/69820289205.pdfIn PDF document text
    • http://cutskytools.com/d/files/44075819053.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/84041116832.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1df3b248a4---49611462255.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10bd96872d---83551524964.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/79541334822.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2ba7f630308bf6ea0167be84380377e0/17814796186.pdfIn PDF document text
    • 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_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 11120 bytes
SHA-256: c8e24f9e98612dafc216702ead052ad1e54bc9ed7afc9b5d8680244e744c2141
font_01_sfnt_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 17744 bytes
SHA-256: 3ca8f83f97ea08a938919a7ed65e8dc2013dab6dbd13b58d20c8033f22ebed1a
font_02_sfnt_off00012a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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