Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2a5244443a9ea3…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 01:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e5a7f025274e88568078f7f2d7bfd1f4 SHA-1: 319fcccfe272d44b25ad61239883deca24fc8669 SHA-256: 8d2a5244443a9ea33fae801d50c8755ea9cc70b285f96602db396232bdf3862e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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://coolingrealestate.com/your-home-cleaner/FCKuploads/file/70824051079.pdf In PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082578d29c44---83938407868.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9e23e1dbc3f0bfb00011b779dc745ce2/fodiponozupoxuzerejijuwit.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/botumajabonebuji.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/gixukewejedo.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/bimij.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/95727222437.pdfIn PDF document text
    • http://bruntpratcher.com/clients/4/41/419cf983043b9371e8393ecf97d676f7/File/tudoxonunuke.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/tebomesapavesunikuxosigip.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/86d4d88664bcc036b30cf07884fc065b/7691593938.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/pubebitujesixotejetojavig.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/derotifaz.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/24682457589.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/64639887162.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/89978772567.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/18bc36619c36fd993c44e18c5d73bb18/10561864315.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/4273658374.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/fosurowejovuzukimexinobi.pdfIn PDF document text
    • http://gr-chem.com/upload/files/61365635584.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/tufotomepuxotuxujapuvube.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/zuvasovene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=official+tor+browser+iosPDF link annotation
    • 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_off0000e5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A9 10476 bytes
SHA-256: aa508589b96411af1da951699a67b3f674d8c540a04b6f47003391858eb609e9
font_01_sfnt_off0000fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 18732 bytes
SHA-256: 90a1fd9594048a56cec3441b8a4c2d2104142880de428de4967b055057b0a3c7