Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b1f87625b2efe7…

MALICIOUS

PDF

99.5 KB Created: 2021-08-16 14:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 980a2292045dbd2fea9c46a0cd264782 SHA-1: b8c32b0aeaf2b8261ee1b9bcb06560bbb2b12298 SHA-256: 58b1f87625b2efe75825f33b63a39da723d44137a56a95d95a5974cbf420b7f7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://paperland.bg/uploads/file/9360376453.pdf In PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091759165394---32145096457.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/79mr2f6i4r7ha6lbemo35gs672/raterunidojuz.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/zejenovefaravuluxetexo.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/489390492ba235b63d54d6ae1da4d00a/xesumalividefezin.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/af7316c507ea4d2d419674761a232b07/wobelurijanapigidefuki.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/fitivusaterep.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/12422241638.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/bujopazufifinuzufamuvuw.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/vowigidopuvomipefeza.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083099f8fd0b---37572346867.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/nejukugutedugafizibi.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd0715e4e---27725704525.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/97793576773.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/sewepuwukavabitixav.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/vkjpsi43vsq2serlaf893m9250/zolasomaxotobutoxo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/epf2vrmdctsup8ga61ruhm1h1e/xutotanovipipivu.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/nodataxenutonefitosisa.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/46500941414.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/b249587b6b0fde0b936bea6088b157bc/70099313718.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e33e7d15c---febegowusoverixifipima.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/g77vb1684osp1sld5aqlfp60ab/74055175932.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098335b61ee4---71128447257.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071e29e64ebe---40469517216.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608361eb2b338---97336601459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=paradise+toni+morrison+pdf+freePDF 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_off00011f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F33 10612 bytes
SHA-256: 5d6d5591943dc8f487713bf9273ca27d2c77468cd110521cc9e7e29b179a5857
font_01_sfnt_off0001376d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7F 17940 bytes
SHA-256: 400d9217c11253532d02b3f2fea7bc256b8e6ecf06a27c6f24656b541a75300c

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