Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda5b71d7208ba54…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 08:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e87c9280863cf2924b437a61cf2a71f5 SHA-1: 6f1c87b3cf52d539ab58eef1d2c1379d1b4e8a59 SHA-256: eda5b71d7208ba541302196c3242d987fffe7e1d407adeaf4454b70238ce860c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=courteous+expressions+worksheets+for+grade+1 PDF link annotation
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/78219812598.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/nobozazojexe.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/remewax.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/87006068181.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/41607546368.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85b16884e---31754570600.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/jogijan.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/d32ccehmh3q7urcmo5nk03uiok/lavimibiso.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/lopelenani.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942178316f7---13027041975.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/9bd2c6b46138b54e78615cc51381cd2c/55380069104.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/f8ba724c1d1798aed054cfb8d40bb4e4/89712429779.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbe677ebd4---31657486307.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/27508011186.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c15e55a240e---vepenulopikezafaji.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/kujezepekopibegozig.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/wubisuraj.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/17263002235.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/zadosakipel.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210613104616.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/11495633292.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/957a8cf9a1ef7902042660f05246bb39/makogapazedojegato.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_off0000d4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 16908 bytes
SHA-256: 17bf75461c88088a35aa8f0c4c7a63f0219696207b60acdf584d0f41ed7b5dcf
font_02_sfnt_off000118b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B3 11192 bytes
SHA-256: 118ffbddc7bb6045b0b96cf885dd1509ab6fbfd9190d1753433316dd274c2904

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