Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef09c73b14a9ad7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 04:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc1c4921b873517484d6b3d0e18a4f56 SHA-1: fc251a6e62bc3a259828499c523c157e3afa727e SHA-256: eef09c73b14a9ad78fd26fa77ce168cf80a010116ad923fae0c4d78857d1341e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=gameboy+color+roms+for+android PDF link annotation
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/44d2ca52869a5b57062110b3c6343c75/33455991317.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/rumegixiperobivukaf.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/selobaberozuguxulowegata.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/fizoxikumobojomomusu.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/24996454264.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/98087646779.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/34080861197.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/2776864275.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/30843540682.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210907023216.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/12288941694.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/pejuneb.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/dufusofojagujuwaseke.pdfIn PDF document text
    • http://surestegc.org/documentos/file/kebowejiwexalilawulo.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d5dddf8fd---14318467527.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/78669894704.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/72125499768.pdfIn PDF document text
    • http://195exim.com/datas/files/kotazozijefudopijedirezi.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/87851003392.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/98475631294.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/15648341184.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/6u6rk2nhruqsn8plavn2jjhul9/xodepexifo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd51f9dc42---51618456958.pdfIn PDF document text
    • https://anandalaya.in/resources/file/24297098629.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_off0000e019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 17544 bytes
SHA-256: 06fdd06d14ee4c4459de5dc066f0df6375e6387960d3948ae51570df0e9370a5
font_02_sfnt_off000125e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E0 10832 bytes
SHA-256: c01c0aebfe2562dbc531dcb7e30f159ba54228087f661b61276e7ed355e4f23a

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