Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3f8d2efa3e8a8c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 07:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a9deb0906db84aca3db51b7518ef735 SHA-1: ac87d24efa78a7e74b8d03e88b13fb7188172bcb SHA-256: 6d3f8d2efa3e8a8c5faf9467384ed63a075fa8d5042df71f5a1cb9bc02f05912
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a visual download button further supports the lure-based attack pattern.

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://chcial.ru/uplcv?utm_term=2+flash+apk+download PDF link annotation
    • http://uelzecht.lu/userfiles/files/63119766171.pdfIn PDF document text
    • http://www.springperfect.com/upload/finder/files/78598853526.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/eab5f96c3e165296178b4780fab3bb21/lukegepaturekalufej.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/xoxiwagokuvovagiw.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/79026743046.pdfIn PDF document text
    • https://mavibusiness.it/file/lejil.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/45906779050.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fb98ad52ec9eaacc52ad7994c74a39c1/18783188642.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/10020263930.pdfIn PDF document text
    • http://web5gstore.com/Files/files/ketinideduvazijomofa.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/61798263211.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/8505573040.pdfIn PDF document text
    • http://fteq.ru/files/file/xexabaxigixalaso.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/vikegatanipuw.pdfIn PDF document text
    • http://asvpp.fr/pdf/74498792324.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/sekidivijajuzurala.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/foxokaxijipo.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/89vcmlo2up94sa44n6cem2lriu/vuxarizof.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9dd98e2bad28769a2f7b7a51e1a90490/lamaviluvidawoka.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b58772accd5bae7cf495f06e0258f1a4/85144163797.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/sobuvawumakonupol.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/v1ikqeg8pctimbpqpsthe2svg5/94221462039.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16139e86f708e7---xipupi.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16139434eec511---sovodupatoranazegeladuv.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/34170707783.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_off0000d9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 18252 bytes
SHA-256: 58887a13ded4ab05339f4ff14b4f36087d215a1a2125bdcdbb1e95e492e81243
font_02_sfnt_off000120c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C9 10376 bytes
SHA-256: 999d55dee10ad103ccaca86f64609a488cb32f95c5b6ab21d5ecb29ea582b491

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