Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4d751c7f1e8de5…

MALICIOUS

PDF

73.8 KB Created: 2021-09-05 01:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a23fa308c64506c7786553362ab0a81 SHA-1: 5de6c822e09340307d0b977a45940404213facb2 SHA-256: 7c4d751c7f1e8de5558519f045a98e3b22ccbb680a624f532771f7e5a83fa82b
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://rheinmotel.com/userfiles/file/75938592681.pdf In PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/n5ohoaup3p81a6ig72v6qhhps1/24914680919.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/guzifaledejaworeg.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d466aee5e06---ligelavexebi.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/19626011652.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/fd90483845745f90bc3370a1c8f0c6f5/81820600306.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b72f6822d1---zejobefujuvowun.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/92776346636.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/70556120985.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/lulide.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///78660793757.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/nuwaf.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/1b93c8d6dfd85652de6b81be8ce658bb/mudutizaripe.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083511e768c0---mosejelu.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0c08b3c397cf9977dbc12c8a897c5fa5/44455647208.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/surefikegufulos.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a509c4bcef4---90271368016.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/gagizugerog.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///kiwokenofegat.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/8ae324fed88c0b93d700526512a8d1e2/xogudezerubajedusitixiso.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///54313669608.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/53995013028.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/fezoxi.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/41806474691.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/288d8b5f82f7c63d923e1aaa96fc8f96/xiduragekalagofekerafiw.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/tiner.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=manual+comb+binding+machine+price+in+pakistanPDF link annotation
    • 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_off0000bb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB88 17152 bytes
SHA-256: 3337c808d037bb160111ee9008a1eae05544536031bf0ed4d349cd03c93f3310
font_01_sfnt_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 11284 bytes
SHA-256: 49f2563c15236def7946e807d9806fb8133005624f4a941e8bfb364095741dc2
font_02_sfnt_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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