Malicious PDF — malware analysis report

Static analysis result for SHA-256 95625fcfc4809951…

MALICIOUS

PDF

87.6 KB Created: 2021-06-30 10:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb57751861706d0a7bc05efb4fbd4acb SHA-1: 5e3c1566083df500ba9142918dcbb1058ee8f17a SHA-256: 95625fcfc480995154b1986f4d02bf8a6b00647e1f41cd27be5f30a9b7b71116
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607db41c87775---7629471990.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/efb976658b83f0da6cd8e195dbbb7bb3/54719267839.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/9ac77f965f83a53ba828e43598c7bffc/xitigovopela.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be84d44c62e---wasisosa.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/774b58c5204d57174aeaee54f75771a1/sasitexodibesolem.pdf
    • http://s-privod.ru/userfiles/file/24775739304.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/584213c340d0ef5f3ce300e729e4bc12/52668808535.pdf
    • http://s-privod.ru/userfiles/file/tizeve.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7690c1405---68104159316.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ba2cc6d13a0c959fb3e2b1342bf14c51/laserodarawifuw.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf8b7a86cc---xonat.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a059b98ca55---70088052142.pdf
    • https://emmaushuis.org/pages/defiwuxadofo.pdf
    • http://vasvaripalmuzeum.hu/upload/file/rinasonobowedadusak.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/upemiobbbv00lvg6u4ingfg0qp/rixelujozosezamo.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda20224d7---januditevokebubuxopelivug.pdf
    • http://arohitourandtravels.com/userfiles/file/10882384969.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/4ep22n3sb750kh5c0d4dcgafe8/bolokidezefar.pdf
    • http://fixafilm.se/userfiles/file/91895444763.pdf
    • http://cuatro-pr.org/sites/default/files/file/50159979367.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/defa7aece62011629b33aa1d4824b517/384259509.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a582dd314---tatefisurarezusubad.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075965c83deb---detejazuwiki.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/bn7hrd6lfi1ebdou9vko64u258/64414681307.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1ebabe86d16e679f7db1c59aa5843b5b/50012195348.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c03ad57d---sabimenaxaditelupidika.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b59fc74e5ed0cff3f9a5c4121dfa3f23/36258269003.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=short+stories+underlined+or+quotation+marks
    • 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_off0000f163.bin
9ccd09c0467c889bc40d62b5a285f343879d94cd9ada9e98b282baefd1003366		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 17208 bytes
font_01_sfnt_off00011dfc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFC 16792 bytes
font_02_sfnt_off00013613.bin
f15fbcacc553eb01895575409435d6a69ee4ff700d65d1aab9d9493b2ca5192b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13613 10928 bytes

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