Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c515ef901060d3…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 09:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d6e7d5c504e1e381357d25975d36ba3 SHA-1: 15b401eaed8e16683abb3a38c740501fe87011bb SHA-256: 19c515ef901060d373869cd1d39423e541060bf9403be3129be1b38f327bd7e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

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://smidgel.ru/uplcv?utm_term=best+spy+video+recorder+app PDF link annotation
    • https://niagarablock.com/application/webroot/userfiles/file/zenupoka.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/fadadifebunutedaruk.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/93174963693.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/57078625001.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/lomar.pdfIn PDF document text
    • https://edarky.net/data/file/laxibeziwato.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/62859735834.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/94980990129.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae1565c539---70384613613.pdfIn PDF document text
    • http://specialcats.nl/media/files/15778319230.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/fujus.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/929775243dbc0c15e70f74c18a89edbf/momerolazidakib.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/bunezofezebimoxalizefug.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfdcfbf927---54484816305.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/kunadiwuxum.pdfIn PDF document text
    • https://path.mn/userfiles/files/tigenerugawafix.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/lizusipodujute.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/wuwitifixaramufavex.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/79296269871.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/lolawom.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/muzojegivuzisoxugonorus.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/cecb3416f1b3ecb2685cafa620ec7a24/rofavimovumefer.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/xirovawibefoxezedaga.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/novilipexo.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3d87ff029bd504aec04d5dc2d496c70a/vosoluba.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_off0000d9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AF 10588 bytes
SHA-256: 8af9d451282e517abc990288b78ee87478546a57484ce26891f657315441fe4e
font_01_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 16796 bytes
SHA-256: c3176970feca7f4e4215bcef05c6f57edb0c4e6cab41288a540cc3a604a21716
font_02_sfnt_off00011d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1