Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed247fd526dd86ee…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 13:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14c8e5c7fd24cd314897962391f14afc SHA-1: 81b801fcee43e72b9d6c37c3ab8f6fc3386f8a78 SHA-256: ed247fd526dd86ee72bdd920c20f14a63212471706f1a89ff4a115c6bf750904
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://vecsecity.info/editor_up/76557206106.pdf In PDF document text
    • http://aucoindeshalles.fr/menu/file/11562249958.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/tetakulukiluvixelitamimu.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/poguxesumado.pdfIn PDF document text
    • http://chongros.com/userData/board/file/9240102795.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/66430868811.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/50713435129.pdfIn PDF document text
    • http://uco-kampen.com/media/files/visurukavevobezuwo.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/mewutejogogukozam.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/60466472628.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351a05f27ae---50206999794.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/6209077773.pdfIn PDF document text
    • http://gibisch.biz/files/files/zazalivaduwusigagu.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/37445122125.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/67096801773.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/12320434522.pdfIn PDF document text
    • http://jljemc.com/upload/files/8743565170.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/nigefotixerofefuwilobag.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/dasuzazemubivebixume.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161358fa8b3f72---xokirufebopix.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161346507aa4b3---xuwibupuj.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/kogurakuwotez.pdfIn PDF document text
    • https://clove7.com/userfiles/file/16662812638.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/9694198715.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/dofozefirun.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/64784817200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=opencv+android+buildPDF 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_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 10572 bytes
SHA-256: 608c476a2226fa2f0057590692ab8040acbc6745a60dc88d73891f0deacd3d72
font_01_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 18848 bytes
SHA-256: df5b3274fc1ca30daef7f8b2473bf10f4a37b7b630ce504b554230a7342babb5
font_02_sfnt_off0001230b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1