Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ba7b70c1f1e4eb…

MALICIOUS

PDF

90.0 KB Created: 2021-09-09 03:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d8fd4fd99135136c29775c93dea1897 SHA-1: 71cc2064e9d412575385914424fd4fdcd047402c SHA-256: b8ba7b70c1f1e4ebc3e05ade2e7c3c6464624b4a69f1cd431ae9b13524d1f5ca
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://verredistri.fr/xmedia/file/61347933156.pdf In PDF document text
    • https://youkuvpn.com/upload/files/woparug.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/43327959097.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/31751006874.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eff253094f---76028254865.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/vewabedobovorusitegejef.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138670278747---93673753691.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/xapupusaxakaxowi.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/xesetev.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139315639db0---7042050431.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/naxovevedodukip.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/47697890051.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/83812609836.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/35566774468.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/47795581692.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/8878885744.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368740e2b93---sapijejunitufivon.pdfIn PDF document text
    • http://staropolski.net/Upload/file/20666334463.pdfIn PDF document text
    • http://adice-area.com/pictures/files/rufonaxoxebowoni.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/37330382845.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/sazaxaxufo.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/dovofaseb.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/89063699497.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/44123799504.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/fasijovoji.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/lofawozexizilefojisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+latest+cinema+hd+apkPDF 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_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 18456 bytes
SHA-256: ddb96523170a523c07636782380bdfaf02ae035e926d96b4fc2f3f7425471540
font_01_sfnt_off000128ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EE 10860 bytes
SHA-256: d66af28c8ccda480f50982d1f2ed777b5aedbb6843c52d4c7e4328f35bc9e77d
font_02_sfnt_off000141e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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