Malicious PDF — malware analysis report

Static analysis result for SHA-256 05bd2a33d9718061…

MALICIOUS

PDF

78.6 KB Created: 2021-09-01 18:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 63f63bdbb2984c523d89e6b3758b7327 SHA-1: fc4b673c8b06a14171619a88bbcbb5472925b22c SHA-256: 05bd2a33d971806112e8c37521759c33bc51b121f65d9ec401c5073dddfba822
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://aldo-ins.com/userfiles/file/7500187394.pdf In PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dd26ba6c3---59253578789.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/sakisatarud.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ce7f46496fc8b51e614d987c66ac66fb/71888947273.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/27351763339.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/10148c64f9e8e7d24e71325a4b62f4b5/64164695516.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074d7461cb73---kefidulumuki.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/lipesugafotonodowavuzeba.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/87644e2b9d984811cd80128b2a72fe1b/42851549789.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/37983950610.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/71625843963.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/vigugudovetetenigepuni.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/99438021288.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/67066213508.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608999c375194---86742568044.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/gibedapatowajigotobifabun.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/savazanadobeforem.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/zutigosusogip.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/9e2dd64030f05ca17c4c9fea83ef4995/31902739088.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/fa72ad7537cfc11e782b60dbe03a4045/67638347113.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e526e19a14---lagexalaf.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/92113553523.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/lenodikexojowupimowolene.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75b13d232---fuzagotupimozibola.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210517030446175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+internet+through+ethernet+cablePDF 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_off0000d099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD099 16384 bytes
SHA-256: ebe82aaf46270fb0e289e697081230cf48c0edfaab2247e576695b8228349135
font_01_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E3 10656 bytes
SHA-256: 2412099c63c79db6ddc752aed712c0cd2c8d8146da23b8a2e42106e0f1f6828f

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