Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0b075e4970bd9c…

MALICIOUS

PDF

71.4 KB Created: 2021-09-28 01:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab88c5e0160cc2b52665683499169824 SHA-1: ef90fb4778efc237b60233d925cc1921d3ef2c09 SHA-256: 6b0b075e4970bd9c716d44aaba49afe9c0c7423ffdf8169ac9c996035b96efdd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JS points to T1059.007, and the nature of the document suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://drafthe.ru/uplcv?utm_term=lock+fire+tablet+to+one+app PDF link annotation
    • http://www.gabrielamaciel.net/images/content/file/wekarujurowe.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/115cf1856991430c704bcba6cf6a649a/7891767808.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16131569d4cb84---fevegesizugefametatom.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/samaniji.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/45766881404.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/37174033228.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sukezikoxere.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/fakegifuvolut.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/periferironav.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/10972746437.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/54528838218.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/pijomebitanebekud.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/kibigixudajilojepisuda.pdfIn PDF document text
    • https://cosmetic.dilen.top/upload/files/75297456990.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/nibuwetosotudupujibizur.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/91378480240.pdfIn PDF document text
    • http://etkenkalip.com/files/74787492359.pdfIn PDF document text
    • http://vodnik48.ru/content/file/80992727838.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/20783597307.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f7dd3a055a64bfe0a425259d15200f94/nitedepevejisuzalikogiz.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a2160daf3fa2b5f501d9ea44ac4fc0da/26085911413.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_off0000b350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB350 17588 bytes
SHA-256: f2eccb602ad06959d9018bb0ccd126745641beaa35b137a5a2e55ae82c33d9fb
font_01_sfnt_off0000e066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 10496 bytes
SHA-256: f5066317d4b6d979cf0787b1081d84150cb14ae2de21069036828af89e0319cb
font_02_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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