Malicious PDF — malware analysis report

Static analysis result for SHA-256 979082ba6a03fc98…

MALICIOUS

PDF

80.5 KB Created: 2021-08-11 07:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e87c210f7a1fad2a7e23a3cbd623d97 SHA-1: 2ce162fadfee0e0cb3f08e95a01e34bb72df1e8e SHA-256: 979082ba6a03fc98d1622ee51d38fefd5f2caf524183c66b3f4b2e0d4355eff2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection names suggest an intent to deliver phishing content or a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://grandhotelbulgaria.com/userfiles/file/32261976259.pdf In PDF document text
    • http://longthinhphat.net/uploads/files/10398914576.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/1c21eb26f12a38a10096c28a968dca77/60978002260.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2b3de84b5---97706297778.pdfIn PDF document text
    • http://soupworld.de/upload/file/wuperawaw.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/takogisob.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/075468187a9e6cbb9bd861c490d497a7/zeraxanam.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/mogubo.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/5a1687c29533728d5cfc6a55905abd45/pevojewawiraboga.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/4404015695.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/xiloliv.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e6539ec06---toxitodus.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c92a7e63f61---7413546110.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/delagejaxabewizamuwu.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/gadojakigutonuzelegigafiz.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1bca421e53105b4d222e232ac25529be/70010459714.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608729cd6f3fd---74251868053.pdfIn PDF document text
    • http://ezibra.pl/upload//file/79427881005.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1621731541401.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/tawoji.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/k7r2iemdgaimh8cn36ufg24ogj/79945307589.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c446d321fad---8080104691.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/h4egte3acphn1ulpqi2rhi8rit/ropaboguvirolutemonematel.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/85343857107.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/46303430783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ilayaraja+background+music+mp3+free+downloadPDF 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_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 16980 bytes
SHA-256: e49ae349ceabd7105498a0580193799ebc68b2100b4a1654279b52f1a779b91a
font_02_sfnt_off000118c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C2 11652 bytes
SHA-256: eae11cd1ca05244ea57a4f118ca582d0d58aedd779ed36d35d3032eac8ae877c