Malicious PDF — malware analysis report

Static analysis result for SHA-256 b903a9c7414ed3db…

MALICIOUS

PDF

114.7 KB Created: 2021-09-03 22:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9328b54fb163d199b5e15a6b3e16ec4b SHA-1: 3c1365e7e61ff62fa25bac9cb4325e319374ed13 SHA-256: b903a9c7414ed3db8de8b8ac754b6b44f4c8be801a7f9e89914d65c8e6d1a698
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://rosycaffe.com/file/fomewifupebotekij.pdf In PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/375145072.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/nemifarofokamir.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3093753e2---tavapidava.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/kotojizukefararirexoku.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/57794a808aa40e131467e1d8bf77c04e/91936494366.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/33934823011.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/gudumeb.pdfIn PDF document text
    • https://soechi.id/userfiles/file/59331597201.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072508f96b90---21678017299.pdfIn PDF document text
    • http://ailizia.com/userfiles/2715971869.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3589ca794b---vopuwabirowulim.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5829892fce636611807029543ae33cb1/bamekulatajogilinofipabu.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/af11e9b97403ebab61604fa607fc296f/21325459281.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f46d72b4d4---nekupixokutaninajere.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608205b025acb---worumujobeduzokefo.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3e0a3158---lidevululikoradikusanuto.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/vozopibukemo.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210724_CB9E465D6183B386.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/kupefewemuvewu.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/pokekugebewemalidikipoxow.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5c42339b9---legizogemituxewa.pdfIn PDF document text
    • http://zenithmetals.com/files/vifewizive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=amadeus+altea+inventory+manualPDF 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_off00015bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BDF 18636 bytes
SHA-256: 30f66d0ac8f2c3035f16d568806f2d32bffeb73a38b81c18434fede7fecc2fcb
font_01_sfnt_off00018c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A490 10668 bytes
SHA-256: a28521b354901d573155ee280ffad19f372cd8f9f39a08b7a952c8c874583ce9

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