Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcef9d9e0fe136ca…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 18:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 89e233dea6befdadebd00b00c7798ade SHA-1: c1da78416da2a994adb6af7ceb39c74f25e6460b SHA-256: dcef9d9e0fe136ca11984550bb0efaf577d1f5bf9a3bdde9a26b94612bda2bca
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or disposable hosting. The presence of these links and the overall structure suggest an attempt to trick users into visiting malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=internal+combustion+engine+vs+electric+motor+pdf PDF link annotation
    • https://wfca-czech.cz/temp/userfiles/files/loxovumigazamusirufax.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/60613243864.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/55979737379.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/34007352681.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c968905436---61898091322.pdfIn PDF document text
    • http://apex-architect.ru/images/file/88979936995.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/fapakisixelefimobalofena.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1ab168e5e---kevetefabulasulo.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/28134567073.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/5233065726.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db1cee453e7---92118796.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/10440510311.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/25630931324.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f14121cda49f3c50ebd2ba7f7d78a41f/lurafamagonerifitabozibu.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1623822683.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/filabikanugemi.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/gonifa.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdd6d5bdf8---xubofulopojobogonuwu.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/kodikaveganobenegebute.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aa8fnimne8h1r8s7j2v051dmt1/76165289925.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/pegamuwutulerivopabojaw.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/jiwisabamabobimoxizan.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7dbae6db1---dojumopuki.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/8f729hghbrlok9drvhel6j5ihh/47781963466.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_off0000d0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 17060 bytes
SHA-256: 00e260a484a72fbaa29523d63e2c61def8bc789baac5af00f369e17c784d38e2
font_02_sfnt_off000114b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B8 11220 bytes
SHA-256: 42257ec9ceb20a54995ee84385ec3c13e1faddb9e7e52c046519755231c5cf16