Malicious PDF — malware analysis report

Static analysis result for SHA-256 074053598218d68f…

MALICIOUS

PDF

78.4 KB Created: 2021-10-18 02:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d76d5c0b1e55ca9991ac9afdc321995a SHA-1: 9e4cf831fb8619bb34af0d51b014a96019f2c969 SHA-256: 074053598218d68f4ad064646dd52f909c097b59d814508389be50de289feb37
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 within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to external resources, some of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://klawiatury-foliowe.pl/_data/file/36456241263.pdf In PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/015bd628fa3b6caa748c6a70c1abf1ca/buripuvopixufilot.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/79764459987.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/13639290767.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/wunewezezadugof.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/xesusapinijosebanu.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/54234360486.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/34128608810.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/20025248923.pdfIn PDF document text
    • http://rococosofa.com/files/files/61076039363.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/genonoliriwuzekilogabixoj.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/xolobofikotuvilabuf.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/40865579058.pdfIn PDF document text
    • http://iucecb.com/files/file/3149057353.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/20426902800.pdfIn PDF document text
    • http://infosierra.es/images/editor/jajoruturoren.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161412010367fc---26814831673.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/53407008994.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e73a6d1659---5421761253.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16165eefa37bf4---wisonasosisawifilexubir.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/71463646725.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/negavadotidunazorozebev.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/43425521770.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/41422557041.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/15179767802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/2I9n2o-U8HI/uplcv?utm_term=afrikaans+words+with+fPDF link annotation
    • https://bep.semmelweis.hu/userfiles/file/tolubaroze.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_off0000d117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD117 10432 bytes
SHA-256: 26e55ead2ce20ccece63fbc44213a0a4e033758dc9d9319d877f3aa247420a7b
font_01_sfnt_off0000e8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 16928 bytes
SHA-256: 612359d230a667ff770fef7d63df454f21f7aee875e2e5f785127666eceec894
font_02_sfnt_off000113e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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