Malicious PDF — malware analysis report

Static analysis result for SHA-256 284e7b238830601f…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 16:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c031cba4f5151650c368444ac59af70f SHA-1: f0de9dee17188a8d1c8547f64035953fd0e52519 SHA-256: 284e7b238830601f9be1345638fa55150dd63415137e1b7b625c89bd5a64dee6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mimpishiodua.com/contents/files/71854855454.pdf In PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/juzoritinado.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/83352765119.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b6b2cecb3edbb2d369c1b809192f8f00/bemaxakudefitomes.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4idvccvjj81sj63ga4i4pan1h7/58637966431.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/f6v5s4o9eehps6luuc4ekf4ia3/51061506224.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/lituzaretasetunudun.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/11325791605.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/walikakojari.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/37524820367.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/rafanod.pdfIn PDF document text
    • http://countryroadssiberianhuskies.com/clients/e/e1/e1b2222506e4b6fd6c510396e08362d3/File/32843226704.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f79b44457---31975669141.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161009a0950122---favus.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/vkuoj04shgal658qkkaoefkhe5/97695920178.pdfIn PDF document text
    • https://triosms.com/userfiles/file/fexogub.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/bivinosogop.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956cb100570---41960974476.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/butafedubejize.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/vinoz.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/perejimam.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a194f2b713a321760fd59bfe1042dc59/kinoxefifekozotubusodojub.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e94bedad8b---70486735398.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/55d1ef27a6bb1bfa3916cb3135a6b213/71928673868.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/nurokenowiwuvuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=emotional+intensity+in+gifted+students+pdfPDF 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_off0000c7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F2 10940 bytes
SHA-256: da35d2a7571c911e718d2243b1f850477456cb2ece9668281ad9a8f33df1ad0c
font_01_sfnt_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 16252 bytes
SHA-256: 1e141b75973d9e2668ec6a38e1bb1751d05132181738264082cb82cc7a37d5c7
font_02_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1