Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd85e4d11b48c44…

MALICIOUS

PDF

86.5 KB Created: 2021-08-29 15:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d958d43141f19e305e376b2b9d1ea54 SHA-1: f5c2a73d565c8f3807db6eb3d4138544af3ee516 SHA-256: 9cd85e4d11b48c44bf10411f92491a4ad042c43eefff3e1f01d4e8de4aaf2e59
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to manipulate search engine results or redirect users to phishing or malware distribution sites. No scripts were extracted, but the document structure and URL patterns are indicative of a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://drafthe.ru/uplcv?utm_term=stress+response+examples PDF link annotation
    • http://hanarotalk.com/userfiles/file///fubuw.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/46360082838.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/paner.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16097d44c14aab---43247841041.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/zavipixekepafuvukesiz.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089bf2c60979---jivezebipivenipi.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/82100459481.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/28082611133.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/wegulijek.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/rikiwajulenolofuz.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070382e0aa88---20330645300.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/36193854322.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/52550026522.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/joxuvovominud.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/71205757345.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-26/20210626040125755264.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/s87oj052a631alttps6fu934h5/40604293177.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608b350e62e0c---17441476664.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779ccddbb67---40026318489.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/vitegebigudejam.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/40075641785.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b5a0c401b---pupofir.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_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 17068 bytes
SHA-256: efb3dd6e5821ffa3373807eaa3c2e9fd725c08c23d0a6b8e721294aa47d750a1
font_01_sfnt_off00011b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001332f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332F 10500 bytes
SHA-256: c095b256df8b3b36142833e417fd6b415a2830f79891f0fafecc2cbff5fa862d

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