Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ec4939e3fd9364…

MALICIOUS

PDF

95.7 KB Created: 2021-08-04 20:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb1107f3ebe7dadfeb8e140b31477cfc SHA-1: 7a431e5ef761e615cce2674fda93f27503a75c15 SHA-256: 51ec4939e3fd9364bba8ca2b13101973939442fde1987ef62510698450169ae5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for information. The presence of embedded URLs and the nature of the heuristics strongly suggest an attack pattern involving redirection to malicious hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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 http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103f9ea7eec0---99214629432.pdf In PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/99d0dd52250ed51665cd58e55d024abd/gakexofaxetaka.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/131554421172.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608461bf8e2d1---48248976608.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/63be5b00e2e23907eb794a548ffe9f3e/bodilejizegupusosolel.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/01defae56ec89a1739fcbe23c578bc8e/mejererujunoxisizotusutal.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/sfcf95pc87n39ci0talb2sgtco/dureku.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/279569189.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t6pdcg3r0jkr2bkigc2tqopif5/80482621046.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/kunuruseju.pdfIn PDF document text
    • http://17njl.com/userfiles/files/51169931470.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/00e9f1bbe5993d4d18bcd68cc1ecb3e9/33327565418.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/3e8a8e70d535b768d78b8599a07c7543/golusoladexep.pdfIn PDF document text
    • http://wjcopy.com/upload/files/vanizavu.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/27860879820.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/4bdf91856cf5987a5acbca80f079b035/tupum.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b724359d92f2a206ec4563c41f6a6d07/waguwef.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/18265644801.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6085d7301---7425892915.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/kamube.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/dde4d5dfafbc528d192f09495052d62e/9655306628.pdfIn PDF document text
    • https://digireg.it/upload/xikupegipulibok.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/83177bfc0b735d38e51669817e6898ba/71690873865.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/9e4f68e3fccdd0907553c6487a5da7dc/30528538849.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/diramakipu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e19412b5a1---vuwudisalexunowe.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/zokebakunogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+much+is+bahamas+visa+fee+in+nigeriaPDF 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_off00010d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2B 11020 bytes
SHA-256: 4cbc1d99d70dfb11e1baf28fd0409ffa9add915f791e397a865124dff43fa829
font_01_sfnt_off000126a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A3 18092 bytes
SHA-256: 2dea8a4e2e33d13af65520c9eb066d9598f08985820433b84efa0cf3b5a76e70
font_02_sfnt_off000155c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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