Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05cf9ff6a9b1aac…

MALICIOUS

PDF

95.4 KB Created: 2021-06-28 08:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e59b48a85a8673c84dee59b3cadf449 SHA-1: 78ffe3b61e8505bc64943801fa698d19df14ada4 SHA-256: c05cf9ff6a9b1aac9df2921c25170381c8ac643f16efa12cc25e3d0afda5ba55
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/tf24np20s2q0rkph7f091ssj3i/revov.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/g7gc4pir3n5f90bkaon205aph0/70221954350.pdf
    • http://quaretti.it/userfiles/files/folavokuzepupumalilerodot.pdf
    • http://greenplanetnepal.com/userfiles/file/zanufevadukidibizi.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/7918340fac63b41faaee4de4ac734d45/99157649059.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cd356a0c7---tewuzamageba.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608777d60f932---64315940023.pdf
    • http://cancercareresearch.com/userfiles/file/kebaleworarobalan.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/360d296260d81aae8eef5949ed79af7c/22743596454.pdf
    • https://mk-sito.it/uploads/file/feguludaranegepula.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b10de2b0---87935924580.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785c38be524---zononopafunizet.pdf
    • http://maychamsocda.vn/images/userfiles/file/vuletesezulelonebijofiwa.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc5fba5d3---zilazeremolajugizufaxedi.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afeb82b98ea---pizabewudoxonowadigimi.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa7f435f2c---koxikusawov.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ff9ea8b1arhrr9bsuabf3bt9mg/35776250552.pdf
    • http://www.leasebridge.com/CKUPimg/files/fisovaxasupatomo.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f837d87970---17832314153.pdf
    • http://nordicaluminium.ru/userfiles/file/61350471651.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/a6m5rg1vl5ji2rko8achij5klp/bomuverirefizezuxu.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e7e55cb4b---rudigebenopa.pdf
    • http://qytbearing.com/upfile/file/rosegewebogonofofikij.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/6b97f209dea3534fa79ca910b729decb/55460387160.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=would+you+love+me+for+the+hell+of+it+lyrics
    • 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_off0001142e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1142E 16792 bytes
font_01_sfnt_off00012c45.bin
834904c24c4de31d139bf9f2758b8edb6de049f521ad5431001947468bb8c23e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C45 10748 bytes
font_02_sfnt_off00014506.bin
6158a372b39d1937a6a607c7bf041c6d04d14c75bc626441a80a68758ec74b6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14506 16768 bytes

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