Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8e07e9150c7f51…

MALICIOUS

PDF

86.8 KB Created: 2021-09-15 09:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3718584c145e7b58d2dc857cc5c35bfb SHA-1: 85cd42f9c1add3bf1fb96610453e038001163b02 SHA-256: 6a8e07e9150c7f518947a005bcecb559ddbdbfc28677169a69edabf90720d4ec
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various domains, including one that appears to be compromised WordPress upload storage. The presence of a 'download button' lure and the specific URL targeting game downloads suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=gta+san+andreas+full+mission+complete+file+download+for+android PDF link annotation
    • http://rentbucharest.net/images/userfiles/suvitifegin.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/boxolegerebagesuxunitado.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/3328038383.pdfIn PDF document text
    • https://km2804.com/ckupload/files/14641079998.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/41542444286.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/31500158483.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/27609554042.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/sefup.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/walakopatiwerezaxibi.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613728a05b243---54141243094.pdfIn PDF document text
    • https://stvorki.ru/files/file/topalogofobe.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/jiruvefetajugurerere.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/7a734cf67765a1ae1ffb50243747c941/3386847049.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/zixemugaxejesana.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161404d7f8ac4f---pupamunewojepogi.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/13347799624.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/tomedizineb.pdfIn PDF document text
    • http://mobitransjogja.com/files/22676497007.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/60775321005.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/82021620911.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/pixupikixulolezajezes.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/38334998130.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/40173371580.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/345991061613bb304e006c.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/40338446441.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141355b0e1ae---96864968243.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_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 17676 bytes
SHA-256: 3364e5c59aa121440c6741e3f82286d635b161b65691c93636a194e9bbecd993
font_01_sfnt_off00011b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001332f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332F 11004 bytes
SHA-256: 80443df9fffc5040fa10a32d5dfe9a39187d3ecb8141aa32b090a5cf513bb6c7

Open this report in the interactive analyzer, or submit your own file for analysis.