Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bff34fe0b3263f5…

MALICIOUS

PDF

75.0 KB Created: 2021-09-17 13:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 497a795bc37c148ba4452c6439818441 SHA-1: 40b91886b6543b316be7da6396737afbe434feed SHA-256: 0bff34fe0b3263f5db2f3f00887dbfb58bbf35ebb74a75354edac520d375f24b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs are designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164f23fe96---75507312550.pdf In PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/17502758302.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/padakopavabebevuxivipeg.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/merugokiranipotav.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/lizirovezefosokise.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/51104056648.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/gugovejajixuvi.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/29900833193.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210901_2D19230EBD08DBB9.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138db1fb5622---salinalozabixukutalab.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/dewubuzipotixerebemilaw.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/59204120478.pdfIn PDF document text
    • http://martonelektro.hu/files/file/kekejebebufub.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/gujof.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3883f5ef---pumebuwevipapivi.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/72203311187.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/kapuvo.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/kafalepirozilux.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/mosulofugepuvifi.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/dc1f4bd0979682657df2a95b9da2fa4e/33288198468.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/zoxanipimuvejunez.pdfIn PDF document text
    • https://novitas.ro/files/vebuvijenifewovev.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/94505609277.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/11441876410.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/rojejiwo.pdfIn PDF document text
    • http://innotack.com/userfiles/files/zafisamivedavi.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/23266262958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=3d+tennis+mod+apkPDF 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_off0000c44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44D 16284 bytes
SHA-256: 31f6b5273426186c334e90a4f696e0033d11c2a1f349c5e3e3d19601c9148542
font_01_sfnt_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 10576 bytes
SHA-256: c436855fa4cbe6315391f87f374e862f0fb99e40631296d07c028dedac16b5e2
font_02_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1