Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9a39051d79b576…

MALICIOUS

PDF

87.9 KB Created: 2021-07-02 09:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36489802bf0edfc65cdbf606e96bd0eb SHA-1: 47220c7565b6e344b6a8aa9b3b3010b3e33feacb SHA-256: bd9a39051d79b5768149e074560cafd50f9ab36cfbb5b507d17775c5defe3daa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The primary function appears to be distributing malicious content or phishing for credentials through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=what+were+the+first+multicellular+organisms
    • http://yuha.be/_files/file/42410750020.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/e7985440ca71be2157cbe7b8c25aabf2/luwawera.pdf
    • http://personnelstrategies.net/userfiles/file/1535711355.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3d5138ec40819b3ed6f5a9ab8d5d1dbd/jutuzasuwonipawaluw.pdf
    • http://podushka.by/files/files/wisojulavon.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/a92fjdu3j8470aeuu8esl8cr34/62631334951.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba13434792c---govimim.pdf
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/de9053d4d189537bb65eb91c961e13bb/89852476451.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3bcca4d8a---11192843923.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9865d019f---95591385064.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/3njr6thvu9gtne4631g7k6312g/13080533052.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29a525926c---89329079541.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/8c90bc57c60c4f58faf6895ec7da6a1a/nogogeliwajikonelo.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b315742c708a7375bcb1a87f470baf9b/fivokeduponifaku.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4fbe4166a---vetosoto.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/52643564118.pdf
    • http://auksozvynas.lt/userfiles/file/69463409003.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2fdf6fbc626773a38ea6a96fd2df2b31/48778281748.pdf
    • https://moto-trend.cz/public/files/fck/file/70879559286.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/2var9s91mdt1291dq5mfefdisa/lexotejorotumexaleragema.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160d813408d7b3---38614940827.pdf
    • http://yuhongzg.com/d/files/19852197092.pdf
    • https://medlineplus.gov/organizations/all_organizations.html
    • 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_off0000f338.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 16792 bytes
font_01_sfnt_off00010b4f.bin
7b21798474fb5bf941e6a179d7e2b16ea175d5fab228f82dc1cc4b1dc93a3d04
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 10960 bytes
font_02_sfnt_off000124a1.bin
0baf5342a2f15141a10544b58b77f362b587805ca79a7ca8a65916128531b290
pdf-font-stream PDF embedded font (sfnt) at offset 0x124A1 17476 bytes