Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1d09c5c5106c5d…

MALICIOUS

PDF

86.0 KB Created: 2021-07-22 06:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 083371441c15c16eeef22c5133031f48 SHA-1: 92a4149bef99dc617da21b05c613f2aed781c156 SHA-256: cd1d09c5c5106c5d8ea738309fcc367cc5642be543c3607f077a1e56e86375e2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609448df5aa85---tapeviv.pdf In PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c68f3906b8762d720d3fb01ad4ada980/61121387220.pdfIn PDF document text
    • https://tomas-music.com/contents//files/5404211394.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/25514972226.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/18096745829.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/pugixigilejoroxuxexuvut.pdfIn PDF document text
    • https://media-get.com/userfiles/files/webapetizudewetajugobuni.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/47d7d640727770581ef3385816cc6808/8118856562.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/durabapufuje.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/gavafuliziga.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/popikisizikadonul.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/41747698702.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/rufeza.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/8576200311.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/tumoravukusamoduvijot.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/61575759252.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/fipomudonunetulak.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828dee688e3---xaxisulipujipedot.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/nubegiwadirezemogasijanab.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed0bb40458---wenuwap.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e58e42b784---wezosewoma.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/lrbbdb7kupsmggim3s2h84o0sm/mebunijik.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e4a026b1---88435546008.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/gc5lbvbi70f1dqi4pd5mgaalc2/23746273262.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/29805627852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=c+faq+with+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_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 17536 bytes
SHA-256: 169e689874e9ac24c50196eaf091b1b9c5337c42c3d4e8c35dd3f971c418cb57
font_01_sfnt_off00011954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11954 10408 bytes
SHA-256: d1f081d71caba11d7e49fa5de9b50fb2dfb1cce41799373af7d217166c30b25d
font_02_sfnt_off000130ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1