Malicious PDF — malware analysis report

Static analysis result for SHA-256 a256b742c0912c35…

MALICIOUS

PDF

87.4 KB Created: 2021-07-02 00:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 610ff77992bb71d27def4c00056e67c4 SHA-1: 5d1fd1f30549ae15c8486204d729eb403e29157b SHA-256: a256b742c0912c35a92fcb893c5e8a57675771d544e9f5dd73b75dbf57c04c27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the numerous embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945997d02c2---puninugufibamizufafe.pdf In PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/611bjhivibgrmt7q2cdemu49t0/bonukafujawixezuzobe.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ac722951ea0f85362b67b54357b49a17/nanuxefoze.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/92320000934.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5485b8433---palerabu.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9788ae1f0---13216830899.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/914f4f9447f72f47978fcb43016f5247/61389091433.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0c0f68f4d---98830456278.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/vetubeseperigumibed.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/kugr2u2thjko6m5k2apgfm7o2p/14341178188.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/62467edc6bb113315364f6cd8f10754b/68781879770.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/110icqfp5qo3k25dr2asstv5n5/44081151833.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f437b5a6dc---81732529295.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/wetakibiw.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/1835831737.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/xogozariguzomofagili.pdfIn PDF document text
    • http://huiking.cn/uploads/file/150528097112.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/66495269294.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/muvatux.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/tidebixunaletesufelixu.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/8j5bfuiljibcsum2amlck40ee0/sapefumodagokin.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609010f6ec907---57100718504.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/fowozidomazubofifemuki.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/10234875823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=adjectives+for+smart+peoplePDF 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_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 16988 bytes
SHA-256: a7e5c2bdccce806cf542a9cb75ceae753cdb73dbbdebe71110c1ecef22eaee05
font_01_sfnt_off00011dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAC 10856 bytes
SHA-256: 5f9ace3df9d2c391bb365d9fc4884d33fcbd649e2b9a444d6c7dc60bf1c492af
font_02_sfnt_off000136c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1