Malicious PDF — malware analysis report

Static analysis result for SHA-256 f617cf0811417cd9…

MALICIOUS

PDF

87.6 KB Created: 2021-09-02 09:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b46b80e325404e3f048450f1eb4f247 SHA-1: c03477a1df3e5d17dedd14e354a129deb86c9868 SHA-256: f617cf0811417cd97f9693ae0c53571a8799c6ef4dbeee6fef15e687055c8510
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it's part of a link farm designed to host and distribute malicious payloads. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/7d0c632fa29b60087a4e8302bd6e73b1/mavevodabolumizogadobex.pdf In PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/eeb7ff8742420a224fb78667228b04f7/52131600460.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/mifaxu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/mj1emmsjdrjjdo559gkoqf041d/46747753705.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b106751bbe0---zogekog.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/mebomosuseruwobapitogaxu.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/58929061418.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/gitax.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/62569123619.pdfIn PDF document text
    • https://penzion-palice.cz/content/20701314951.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/80595678586.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5df8147779---xusez.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/82922129119.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160800c433130d---kokime.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/f727f5dc759b9c193b46a77eb0289fd5/davorigipilusixofe.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/daxeza.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/zuwuxenag.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/e0hcrqjmav3323s8e4rbn8p097/daxatajebotad.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/vigibibipolu.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086401fa8caa---80359370384.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/zugeruviresaxuvux.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/63929072964.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/lamigixonovimulemimamon.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/po59mtivbi46d17q7cgdukunr7/xijesadopokuxuk.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/82007537040.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/voxumatelulagexok.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/38780375924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=financial+accounting+6th+edition+answersPDF 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_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 17900 bytes
SHA-256: ceb5f1ac42aae3a32e33a5a0e94d4135ebd86460b9a08f34ebae093a317d5749
font_01_sfnt_off00011e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E79 10980 bytes
SHA-256: 1836475815b1e373064dc226a6cbb142917bda23471ab2407672868c0f2cb5f6
font_02_sfnt_off000137cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1