Malicious PDF — malware analysis report

Static analysis result for SHA-256 e548dcb586e5bd21…

MALICIOUS

PDF

71.6 KB Created: 2021-09-10 04:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 611898ab2630ca64e73bd71b9af78f9e SHA-1: f15f763a8b8be4d2501cced05723f3f887288512 SHA-256: e548dcb586e5bd213e3811562290c2d728c6f25a5cfc5c5bc544809e678b447f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting an intent to redirect users to malicious or phishing sites. The presence of external URI heuristics and link farm indicators further supports this phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=lucky+patcher+hack+coc+download PDF link annotation
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/82d3a037ec872be71820334de98e02a7/25032936499.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/88501304448.pdfIn PDF document text
    • http://screen.by/images/file/xalivu.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/16464439173.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa2b33018a---6933702754.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/polizuxuwodafurajulebin.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/65313129677.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fudoxubisefafez.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/8453178839.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7e919e49a---80794293377.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/xopamikujaj.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8d2cef0a83f68e9240e34ab40ae05442/44180350535.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/xapadibozuganoduvi.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/lekawezegokanapofajukod.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/59486627755.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/zudeb.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/xowivakemazexatifileva.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/lugotalovejizimedaw.pdfIn PDF document text
    • https://bem-sa.com/img/file/30032204121.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/65020958904.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/27dcb11963b61be6a7438a2f06fa65c9/jakifojatijani.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_off0000b444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB444 10700 bytes
SHA-256: b0ace7fccdf6763bfd5a56ef1013097a4aa701851303bb5baafec21661204398
font_01_sfnt_off0000ccee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE500 17348 bytes
SHA-256: e9d2caafab9de8456289258035eb6043531a65ee816b8ca67914f7c83e2ed9a7