Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4b48fcd742e64b…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 02:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a10b78017e429c51ce99488678939d6c SHA-1: 4619d68ce77f4e4a25de220ffda77e7e440b00ed SHA-256: aa4b48fcd742e64b1f7f46b54a17868cbcaaed62182efcd8ffc20852e9bfee44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://philabc.ru/uplcv?utm_term=dispossessing+the+wilderness+pdf PDF link annotation
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135a564b9bcf---73379084359.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff9181aeaa---89318181301.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/dojodaxexuxetoji.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/og351qv1p6fvjlsm5dlcepjui3/48531390217.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/67484541424.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/4344099228.pdfIn PDF document text
    • http://www.moyekolodin.com/files/ranoworenisisifuza.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/zifewofivuzogufozebo.pdfIn PDF document text
    • https://people11people.gr/uploads/File/38470516695.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/51d442aa812f1215af018c91efc02cfc/guzawoxusarubofebedemezak.pdfIn PDF document text
    • http://jinohair.com/upload/files/80683609092.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0886b0be98fe1e908351b2f1ac337312/69809029006.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ac37a382f32e9e89041f22fd74a4299f/vudizopajujigefilokedat.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612158d4aa22a---55667494666.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b69d9c0cf97cad798efdd07ae91d654d/wagisopibalexelijek.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/faxexobewujiwupugegol.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b806c252---pojugofuvukavi.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/26310940457.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/vagezawiz.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/tozolutanokojolani.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/nigoma.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/nonanotemebipedonuj.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/36000206079.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_off0000cc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC15 10700 bytes
SHA-256: 0702d92428fc829fe769aafe19c268dfe13f7bfc0fb2e043b8d098d2b3b2bcad
font_01_sfnt_off0000e462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 18244 bytes
SHA-256: 0760e3f9491871770a97375a830b2a162c57bdb5274a49eb923fd16a22e22a5d

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