Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f9ac9465d6d4ea…

MALICIOUS

PDF

91.6 KB Created: 2021-08-07 06:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20b0bd92463450540859c2b90332f140 SHA-1: 8f4b1a750dce8c3179de28ca8470d12f9883de69 SHA-256: 98f9ac9465d6d4ea4ad40853321ef4cc1885304a09fd9ad1f612f36fc0ed8259
196 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line context, a common technique for executing malicious payloads. Multiple URLs pointing to potentially compromised or disposable hosting were extracted, suggesting a distribution mechanism for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://mimpidia.com/contents//files/kafarabedimisutot.pdf In PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/4e57a5e48b5c82be69897e4f48f17cd3/89027504451.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210715_8BC23C0846EEE998.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/gubokamixaroxerafelam.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/67edb7d3b6b8ccb5c2cc19c682ccb88b/lujonomatitafaru.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8fd4abe88c---90428194817.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782d2c2c7ee---panetinojotarijepudalife.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac4865ca5---89381964654.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/30526111228.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/25583905703.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/13961295922.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/43958878385.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788320177b0---sirerajefur.pdfIn PDF document text
    • https://lecachet.fr/docs/files/napudupikile.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/kp14i89h64f059sdbpodd96k7b/88087446318.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d083b5687b9---70635704083.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/a7acd021d03a86ef9c7bd086e943e7f5/wulajopapimesuluzunaji.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/pf77c63uf581pm2b6p0md91djs/muselegalewafonukofo.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/genepewozejik.pdfIn PDF document text
    • http://george-dollie-nelson-mass-reunion.com/clients/3/33/33de80a6744892f7217a81a137582dad/File/lekiburijukapu.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/74722427753.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/97a2cv3fa3kei5ehssbmi9sjt0/82725032447.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ftaso3rimtuh78a004je15ghe5/bodiwidorelo.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/63672577940.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/vizedexapevulib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+many+points+is+a+5+card+run+in+cribbagePDF 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_off0001009e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B5 11376 bytes
SHA-256: 93a1b2c29e74da07b1c637310ff333eb5e5ad85fefc2ba5a96bed296a1219939
font_02_sfnt_off0001332b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332B 17036 bytes
SHA-256: 9511af7c4be1b34b3358c00f498e63634a4e5dc72fb843e1dfafaa1eb09e78e6