Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93ff61530b824e0…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 15:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2364cf0b7d5436b8f176f702f4c97f0 SHA-1: 7d35d3c1706376305cec15ca2a5652f6bc7ceccd SHA-256: d93ff61530b824e0669dae01cafecfd22e3c5c8ceba15e8bc3e0b7b481a15b2c
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting it's a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://trendstyleimage.com/uploads/ckfinder/userfiles/files/pumomedarisateliweb.pdf In PDF document text
    • http://a-mega.ua/images/uploads/file/gixagepoxilogi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/totekufesuner.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/7678e2293784dffff461ebe316128b33/60575012065.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/65390283595.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/tepuzatujagini.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/nezitemelebozelar.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614346fed35b0---sibewuverefipo.pdfIn PDF document text
    • http://mega.kz/media/upload/files/38098936591.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/puravekefepap.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/85456013254.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/rozotevivi.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/pativuripukij.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/29381442866.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/tegav.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/ditipor.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ff45200e5---84066611062.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/33050382342.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/56500826199.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/20126016564.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/37393335331.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/togezokigobadifabub.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/libelowifinafil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=kisah+sang+handmaid+pdfPDF 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_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 10440 bytes
SHA-256: 8c73e34e5dec7b0687f4e13877f80d05bbff36efab4b325d4eaf0c92584af304
font_01_sfnt_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 18520 bytes
SHA-256: 421e2a6327ddc6fd41ac4d809044179d2916f8f7c5e9acbeb8a503cde139593e

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