Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d836b67d24aa36…

MALICIOUS

PDF

86.1 KB Created: 2021-08-22 07:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b080a8d4a65b312106a2f9316fc09ce0 SHA-1: 94065374dfdc2c2f36e4db7d55f181069ecab0e0 SHA-256: 54d836b67d24aa367d3e76eeee633e92b894299c0f0fda364ba53126fbbeaef9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://nesthomes.in/userfiles/file/zakunudebabuwadevifiligex.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa589e0c838---popenafabogoxi.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/noxukafasitivesuvo.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607181c982419---fipamage.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/37817aef4acba3902eedcc71aa51db8d/78529042903.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/muzakanalovibudiluxa.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/29c3c57beded103e0d7b353758498808/50806754355.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/malifobugukoxejixe.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160935b7c86cf7---silubopor.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/780952366.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/68075790409.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/xapuxivog.pdfIn PDF document text
    • http://chongros.com/userData/board/file/36581042900.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f66b441b3c---71124104127.pdfIn PDF document text
    • http://sigep60s-ncbeta.com/clients/44785/File/danukato.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/62k65kdrjlolo9m84tbeq2408l/75863730592.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d266c2a243---92787218503.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/6e7880158c165e61a0f99774fed64893/81665711329.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/puzisogikonapixodopo.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/buwapesub.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2aee4162f970706161867515057ef84f/dadogowubesekizekoxedi.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/69088959705.pdfIn PDF document text
    • http://usateatop.com/_upload/files/wedujowerum.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/mutekij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=verb+to+have+exercises+worksheetsPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/37179657909.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_off0000eda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 10632 bytes
SHA-256: 73c1bc522f2a35198b658c48f3daf6d45933a31b73f12103fbfc95222845538b
font_01_sfnt_off0001063a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 16076 bytes
SHA-256: 39c8f9077dcf0681b14d77ebc508c27e27bd88dfd7ee4f66743092b382204ec8
font_02_sfnt_off00012fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1