Malicious PDF — malware analysis report

Static analysis result for SHA-256 1504d1a71acbcde3…

MALICIOUS

PDF

76.0 KB Created: 2021-08-23 13:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f1cb0844503489e7d87f89ba3690e396 SHA-1: 13bcf34ad8919edd9508ec5b6096ff08815b4849 SHA-256: 1504d1a71acbcde3b38cd75b483f9f8360bbcc8bf2a258275c1a3586b9a881f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, aiming to redirect users. While no scripts were directly extracted, the PDF structure and URL patterns suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=the+hideout+coffee+house PDF link annotation
    • http://progfin.pl/userfiles/file/73417750951.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/dajoduwojugakifavegot.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/27748056045.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/pofuxotanenoma.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/xumunetijonimubamo.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608082bf5fd93---takelo.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/cq9u6id8unjh8lass2o2tgcvmv/77107984513.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/hu2ohg0c76dflu69kv9s4stc5o/6288972573.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/2btqdnfm4l8n0pikfs08t35nqd/jafanevo.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ce2e3b5a8c794679f86e015ab825d3c0/vaxineleneragejitusijagex.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/ed0853ea61a2278f2b7146901426edd6/kobewogitupama.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/8fbdab627506e4c21df2085561d7a662/fetuforumokekesonikadugev.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f3e37d5b7937f798dd4d030d02d7c2fd/85823688225.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd94584b0ae---nufijuwogikepizorimevaj.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e2be634e7---mononupamo.pdfIn PDF document text
    • https://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/47006668894.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d688e9b5f06196633aad0d6baaf1a8e9/tekelo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/dbc6fc9fea246d43198dacaa26dfe363/56302188109.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611f62fe3909e---56734588959.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/wufujaxepufifapisigezisew.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/81656772386.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb946c4b6a---5829710482.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_off0000c782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC782 16676 bytes
SHA-256: c943c59f1bf5d61e7667bbcf39e22ac8e628dedd4011c6ba87e082165f1f2242
font_01_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 10224 bytes
SHA-256: 16c3827b115467b14ff256f95870ff1b7a15ab3f4e875eff369011b03dabaa61
font_02_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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