Malicious PDF — malware analysis report

Static analysis result for SHA-256 518d3c71fb469004…

MALICIOUS

PDF

85.8 KB Created: 2021-09-16 10:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 131d43873638aa8942b39eeb0e76f9f6 SHA-1: af1cb6394a79d2dd7182e7af6a4f62f5cb9eca78 SHA-256: 518d3c71fb469004df673cd34b78545aec03828cf4134420c087865698f3ba0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS upload directories or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=ps3+games+for+android PDF link annotation
    • https://ibshospitals.com/userfiles/file/gujebifumik.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/62460680236.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161427f316067a---29358366500.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/70501525849.pdfIn PDF document text
    • https://alpinashop.bg/files/51848629087.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109032019426478.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/74689989815.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/43a231404fdd598bb1627037dd4d33f4/89007061081.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/19115614141.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/17166544245.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/pilokaxu.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/32497262596.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161359f2699962---zijepovelalegi.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/6612850518.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/filogiku.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/77316832048.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/mumiwage.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/xirekugeroxozizifutojupex.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/zupudojad.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/jipepamakunijijaxuzifepo.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/c77092726ea6bed525bb6cb85d6afeb9/judevumerutonulotufado.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/13/53284376715.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/jotobidakixi.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_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001064d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 16664 bytes
SHA-256: cd1fa4bd3f0bacc9cc48cf5c0a662f7e7ae2cb201106c7d093ac37915e6c73e6
font_02_sfnt_off0001314f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314F 10724 bytes
SHA-256: 0e401c74de03ce001a4c4fb2d0d26842ba5d528aab3162eb8ebaa3cffa73dcc0

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