Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65b5e96dfa90d94…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 10:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 387753b9311a7a678768b96f1c8060f3 SHA-1: 07e65a08a56c05dbf1efa9ed5fc5a551649e8e7a SHA-256: d65b5e96dfa90d94bb2b80709ba48959d12b2877872f7759ab18074205c67b3a
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 functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content or phishing sites. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d15b00d9f6b798cf59725e736a6240c6/83013314039.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b75965946dc---bofoxuw.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e43fc5a63---42030274087.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/41241584247.pdf
    • http://dzbnf.com/upload/file///37846693713.pdf
    • http://westernstudioservice.com/admin/userfiles/file/25837261677.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4ce74722d---lebiluzinevopami.pdf
    • http://www.yoko-ono.be/images/userfiles/file/mazibuxizex.pdf
    • https://damiel.eu/userfiles/file/dezupapegofime.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16088c2a20a291---pakurevibeb.pdf
    • https://zoorichi.com/temp/fckeditor/file/94242572734.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cfd4366a2---94956097693.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8e8ee905e---reboxegumarevawe.pdf
    • http://aelma.com/sites/default/userfiles/file/75638908323.pdf
    • http://hugslock.com/app/webroot/img/files/82588399241.pdf
    • http://dajuicebarus.com/uploads/files/38274460534.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d8631727---21552190707.pdf
    • http://short-story.ru/upload/file/34460080418.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/33dac63a2afe02e970ffbc99e968f337/wutekewotidiwizitita.pdf
    • http://massarentearchitettura.com/userfiles/files/11184803131.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a4665b13d50---34574075813.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=watch+the+edge+of+seventeen+online+free+with+english+subtitles
    • 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_off0000eb6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6C 16792 bytes
font_01_sfnt_off00010383.bin
fa7e3ebf054c5afdb83ae74b1ef418e0ae4e0ff7be48db5692f1d3d345693316
pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 11140 bytes
font_02_sfnt_off00011d56.bin
7ce5b9f88f0e3b07a16b4325b30721f104689b68cb9ed18215630ecf6bf4c91b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D56 17212 bytes