Malicious PDF — malware analysis report

Static analysis result for SHA-256 1571f1224c4497a9…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 18:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 17ff757cd90f5b3227e72c31face1ad4 SHA-1: fee129c3b7de5283150985c74cf9fd872f3c211d SHA-256: 1571f1224c4497a9ff174b144d2fe3ad55f388b5078ae59ac5ac43e3110bafbd
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=programa+converter+pdf+em+word+baixaki PDF link annotation
    • http://eros-arena.de/eros/userfiles/file/wurifenugir.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/cf42cdf124a13038b1c97f2b6537081d/figowomowarun.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/nmce98ihmd6mrn10q7hgj6cg5d/mukemekujeximaduzap.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf149b396c6---defarakukirosazebomakane.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/nubabomevijitofavumidibi.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/55626456763.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/76043103854.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/22748972350.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160906c2c84f04---lajonojokuxadewojovevufa.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/16031202557.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711c457172e---wikoxolidifomebawiku.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef7bbbbdbc---87344132873.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/19506572103.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6b8b77f98---xitanixavixiri.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/sonin.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a74191238---26197610189.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609319cbc6a4b---sekuganori.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/76900071504.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b925a8b3ef---givezajatun.pdfIn PDF document text
    • https://unosms.us/userfiles/file/59860351409.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d279a67470---18528577824.pdfIn PDF document text
    • http://gensugroup.com/upload/files/fexezuzofipa.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/js8bacov81v6k3kc9kdsq98ao6/33743249235.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48149e623d---37989146516.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160943184d041b---77008523421.pdfIn PDF document text
    • 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_off0000ce9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9B 11236 bytes
SHA-256: eb9b2acfb105dd70e8e99f4692f51f860390964553b92468bdc1db71c9a9724a
font_01_sfnt_off0000e898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 17784 bytes
SHA-256: 3ddbff94d67b4d9e2b36aec1785ac22eb1391ac4697e8f9356d225224ad0b530
font_02_sfnt_off0001159d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1