Malicious PDF — malware analysis report

Static analysis result for SHA-256 9722343688f596c2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 20:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8178abffda9ec3e70c2daef57b7f9c04 SHA-1: 22b99b0e201d5babf72a1c66d3e6c85b6b0c3c19 SHA-256: 9722343688f596c247ce299394ec5a819c3cec002b53736f8a47b607608b9b82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://dewalt-naradi.cz/media/upload/editor/file/vepugaviwaxigamexibogawig.pdf In PDF document text
    • https://marikakozmetika.hu/editor_up/26610259024.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/87009233092.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/43f7d19789718427d53be54a1b4224b3/bikawumalaranatapupepo.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc87bca957cf2b883b8b48afa189f900/12935657547.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3be84dfe5---70763631984.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/vixumopenewobusetawesifo.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/zubivog.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210809060831.pdfIn PDF document text
    • http://omni-links-europe.com/xolaju.pdfIn PDF document text
    • https://aedwea.com/upload/foto/zeloluker.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/dixosibepinibis.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/52432278669.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091924a68421---55400453281.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed5a5d82a9---61949968636.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/40d6de877a7b949c0c64d60929d1d7fb/63222071705.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0def67ea0bc2226b00391a5e618f62bf/zivixetixegaxeli.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/73446401842.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68614151005.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/66320190387.pdfIn PDF document text
    • https://renault-service.com/userfiles/tutevuwivigudopenoz.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d9c83e0b9---mifurufajugofigifoput.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/susebojezupowemug.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612938b41938a---ditowabozafepolobuwa.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/tokodosel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+beekeeper%27s+apprentice+free+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/64673487034.pdfIn PDF document text
    • 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_off0000d898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 17336 bytes
SHA-256: ec990b72b07c3ac7d9748abe988e6b045498018d827e81187db2325cf96d94b0
font_02_sfnt_off00011d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5B 10780 bytes
SHA-256: 648da26b22120b0736ecc1c76adc86f7e41eb4453485b2609574b2b5e0f77242