Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff92edb6759a2bf…

MALICIOUS

PDF

79.5 KB Created: 2021-08-18 22:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c62b79bb6ae27aa75b806274911b6c6 SHA-1: d9ba6c4551c26217fdb7eb774e00c42381bcc07c SHA-256: 2ff92edb6759a2bfae137e292acc5498eec3387a001ee5b2c1df213b4eb95afc
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://afghansolar.com/userfiles/file/82529469455.pdf In PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16097bab9aa61d---lufegeg.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/777cc06585cd2dae7c504bc07b517c6e/8106160281.pdfIn PDF document text
    • https://egf.tw/test2/images/file/3017701314.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50af150eb---wutuzujokib.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/zifaxoloni.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/fafufuvaxefo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094e0238ca2f---kipiridabunegufimezitop.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/xewevalezojerapija.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/nifajewumodonudidawosate.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mazizewunowifumefizetu.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/9b7161bea05f6268fd71eaa33237a80d/78218297858.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611726eaa45ee---fijelabepeti.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac942bccac---lexeju.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3134a6f23---murugevifeberuvo.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/12092833324.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/21618454309.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/purez.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/22289548680.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/2336125167.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/98310904728.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/zafowofawifinolepetif.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210521195440.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/xudadesogijipuviz.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/18862645971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=formato+de+cronograma+de+actividades+semanal+en+excelPDF 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_off0000d382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD382 16488 bytes
SHA-256: 50e3fe51eb565a68a967bfcac02e90694b089288b81b2c5bbb14b8cf5384783b
font_01_sfnt_off0000fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 10860 bytes
SHA-256: cea7572cbe584cfd774c396385caae0c27dcc95bbfcd209211463d3dad27779f
font_02_sfnt_off000115e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1