Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78d47488e21eafe…

MALICIOUS

PDF

73.2 KB Created: 2021-09-10 06:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da384b5e4c0a146de043c0342ace6149 SHA-1: 16ca3d888c04b507d280314e6e73a65eb4a1ca65 SHA-256: d78d47488e21eafe19cca814aa618c9061f8d911e51c8c3780004154539ee3da
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 WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://stjconsulting.it/userfiles/files/voxukaborepod.pdf In PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/90913389851.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/85711592339.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/2139185413.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeff60ef91---doxuwujo.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/63074939352.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/32447782051.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/1908079753.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/rudojig.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/27915526125.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385c92d3d3d---71792372116.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/maxegalerosov.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/fivofodelijokowukejix.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a1c7519132bc0977dcc82fd4d532e0fd/mufolosixewoximirodiju.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/81146503f72a046c9decf60112153b01/tawowiselagigexunobapesuz.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0930697001631185391.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/lifotedawexazetedi.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/sunel.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c22b340b1---23833166130.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/notofufa.pdfIn PDF document text
    • http://reopen911.info/media/file/xerukawuk.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/benoze.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/kesanikuzevujokasitiv.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/14564988255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=gta+san+andreas+apk+obb+for+androidPDF 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_off0000bb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB17 10716 bytes
SHA-256: 4e784f340e752ffe82afeb3145de39f99ff093f44f4fbc01624f49375b752c3e
font_01_sfnt_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 16884 bytes
SHA-256: f95bcfc9fce1544bb0e50ce1e72602155b2809ba9f07faaed67579b2737b5d73