Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4a861bd42f4a44…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 02:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e68da0a5f3f3899f0c5020bade996ac1 SHA-1: 1ab19bf527a62c6a91c47a0a96b75faa6743aaf7 SHA-256: fd4a861bd42f4a444b61f641f84539960cf3612f6fc6d4c07b0c0fc3a8da8c2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also functions as a link farm, directing users to various URLs hosted on compromised websites, likely to download further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://medvor.ru/uplcv?utm_term=electronics+from+the+ground+up+pdf+download PDF link annotation
    • https://shellserva.nl/docs/Image/file/ruxadufowezilizifukizo.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/nolevizurumobajudit.pdfIn PDF document text
    • https://coluer.ir/documents/file/22155429037.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609b25cee5450---gegedizafedimosopaxamizek.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160809fa2dd14b---36908912595.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/apotiwewupuzilovevafonez.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070f7f002411---kivazifefomiwuza.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/21815922480.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/15842699591.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/cfgsfs6a3r4iqu5n33c14bea94/zepakijer.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/tebuxedoxebamumebokove.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ae268c1b2---fifipobomajekujanaxi.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/figuvuvetejepipisajosina.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210618211602.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/678623307.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/nubetoj.pdfIn PDF document text
    • https://nicosiacaffe.it/file/51024747576.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/sazabelodapenilepa.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/movalarowipemajudita.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/73315059960.pdfIn PDF document text
    • https://sambelteri.com/contents//files/sokamugukulovibiwisora.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/42b2646aa12d6df94618352264e1a469/damutusuxebadasupopebaxo.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/pewowiredutebevajoreka.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/73877214395.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/fukonexaberepowod.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_off0000c5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 17060 bytes
SHA-256: 6f1843571c13fa49cafb0cf12bb73540085d197330fc9f79049afa36ba7ab6e2
font_02_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 11236 bytes
SHA-256: f45d89f5d2d4099b456e5b0ccfaf16be04f2db7c86ce7848b1abd4671403223a

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