Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f1bc7a07321bd2…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 00:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db9dbae1d46a24ec7f41ee5422e18fac SHA-1: 12f0b964a84bc8a2114ab9b63b5dfc5b9a84f7ec SHA-256: 67f1bc7a07321bd241f2c57392f2b833d99cd94371a14a7167ed8b5426f986af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to lure users into clicking on these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=cse+with+specialisation+in+artificial+intelligence+and+machine+learning
    • http://vtvxm.vn/userfiles/file/tadifufa.pdf
    • https://datajournonepal.org/files/xivivoxekumanativuwu.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/ce5f64a9ab099452c60f0ef80c0ed121/dusivazapukalip.pdf
    • http://isgsrl.it/images/file/1498007320.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a32b2eaf2---sokarubib.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b3a488a8d---sefeveralupuli.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8ad69ee8004aab654aae72888ae299a6/lopisuniwovozedugowirolam.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b4c8a0fe046ad467b95ded68aba642a2/12439135248.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/93115c091072328da048ee40cb7cbd3a/nobobilanafe.pdf
    • http://www.aportecnica.com/imagenes/editor/file/77533818204.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfef4c001---52691688634.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778de32ef81---kegibakivafe.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846fff6718b---2799587663.pdf
    • https://lotteppta.com/beta/assets/file/60331516547.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/75985332215.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9e54eda5da64622b2df6b92d231e25c8/62626447417.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3f7ac86ba5d7ac980eb3f281c91755e8/wulegovasepunefot.pdf
    • http://bioident.pl/photos_fck/file/kotutirerubowuzafiwik.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e7d92c2045a8c6c0aad8aa4aca19a654/10867591578.pdf
    • http://gallery4walls.com/upload/editer/file/55416241125.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/qpufbdt8u8kujfre4jbu3itio9/wimedamobetowotow.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d4d0ee63dc0a7841e028a5fe2cd05fb2/wadebiwusikotepogenam.pdf
    • https://marigabung.com/contents//files/13666923568.pdf
    • http://seanmore.com/userData/board/file/38842991477.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 16792 bytes
font_01_sfnt_off000102a3.bin
063b8247c9837d69f88d601f61d80aeb97bfdecacd5270d03dec2c18feb9e1ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 11184 bytes
font_02_sfnt_off00011c79.bin
669d06707f27b941201f2a3e79187756bf3bde86da9e83681f4a050c6724b6fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C79 17652 bytes