Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc51f778d2538f5…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 05:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 364886ae19ee416cad2c3c32c7c05c94 SHA-1: a0980705534c5e4cc8f58a8f37076dd6979bd2d8 SHA-256: cfc51f778d2538f5a3029a50dd5cc89503045d6e38837f97045aeb69aef503cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=virginia+woolf+a+room+of+one%27s+own+pdf PDF link annotation
    • http://52963566.com/upload/file/202109061750426915.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/nerus.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/jexelefazesupetuf.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/xabipadu.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/59410017015.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/nujumi.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/givuwefe.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/40c301d90bd16dc71b5bc023937c2c99/daxusujozanomanokozom.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/puzigumexilejavuroba.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/1268628999.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/mudelagi.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349d72b1ac8---77821254653.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/44157796185.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/budugijuwerezaxerupo.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/60858225335.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/rilazetaxirevinob.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/46842957490.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/12272065216.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc56f2e5d---puvog.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/woniwujum.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/logulid.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/95459336873.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/juzabi.pdfIn PDF document text
    • http://staropolski.net/Upload/file/wovoxulid.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_off0000d111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD111 10832 bytes
SHA-256: 922015f9f9b4c87bcc15e2040504f5c40284d2ceddec2755103208f35b434100
font_01_sfnt_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 17596 bytes
SHA-256: c957d8eb8933a179319af30dc668305e902cdd6ae2f79fc45788e2b52b05e361
font_02_sfnt_off000117c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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