Malicious PDF — malware analysis report

Static analysis result for SHA-256 a907daf9e283bd2d…

MALICIOUS

PDF

72.1 KB Created: 2021-09-04 11:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2397f7ce52eb485531e5142511c672cd SHA-1: 43668d4ec6e1e0735ca89b8ff6daf3cd92ae11fa SHA-256: a907daf9e283bd2d604833858a98f97f9dd6a1fbbb8ae04c93682b40e122b971
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to disposable hosting or compromised CMS uploads. The presence of embedded JavaScript suggests potential for further malicious actions, such as executing scripts to download additional payloads or redirecting the user. The overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 6

  • 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
  • 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://catamma.ru/uplcv?utm_term=simplify+fractions+practice+worksheet PDF link annotation
    • http://laxycoffee.com/upload/files/rejefusaforotisewuxixexen.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/15530850109.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/98882172256.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/33e7a994b373216df591e95578d73742/suxofo.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/73974902749.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/remegetevikav.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/79072284684.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/95133426638.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/dasanizidusizutidozukope.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/lagok.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/kodujujusewelebavan.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c06dd961d---94129158519.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f27aabb2389---mebakosukatikixepetiw.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b4961851bee74396a4bf83f0d3c552ad/piwijadir.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20218102219337478.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jixufovorififiruretixa.pdfIn PDF document text
    • https://lasanisports.com/files/buvajozoziv.pdfIn PDF document text
    • http://sparkpro.lv/content/file/badusaxezabovo.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/wijewivipulirexigamizaviv.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/vuzukonuvimuxesoxeseg.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/nijika.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/pofitalupokurotosokor.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161212bdb9da9f---gusasaxigemexabi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE500 17056 bytes
SHA-256: 8983e3a2f7239c13568eb2db3f905fe6e575427a62bf0b1c4147be580984c59c

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