Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e250f783aa75ffa…

MALICIOUS

PDF

126.0 KB Created: 2021-07-19 23:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f0f4d24f3058625a6e61e610bfa33b26 SHA-1: fb21a4653ad1f252546fde57679e0381400c4c6d SHA-256: 9e250f783aa75ffa3ad41081609954019e80f969f5e9be898c0bda975ccb916c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The heuristic 'SE_CALLBACK_LURE' suggests a potential callback phishing or tech-support scam pattern. Although no scripts were explicitly extracted, the nature of the links and the ML classifier's high confidence score strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160bab41c860bf---87422948571.pdf In PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8bf1c6eb---29909527907.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/padirisapofixeli.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/zisativinejelefiziniwu.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/dolevonexezamemenif.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1173f6c5a3c5e27706d69ecf0192ea40/72455830753.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/49ae9afa16a65c84a360a43f936aeffa/30068641802.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c7483868c---44210150519.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b77b4d20caf7b721a80d9966f77656f2/zijad.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/62319797287.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/46761277845.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/roritiketofetugabiriwos.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/52851fd4532d119b1c1c6bee18f7c468/33704422533.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd393de9e8---98649856728.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/51461657800.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c469a63c3---62192867041.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ba3962c6731acd6456e2f65307230c60/faxanirimagakonemu.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/188075609466dd14e256710eea4c7077/24663818396.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/87334544457.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/6pusv6tn4erap8dcov5veml6b5/runokonimabubidunu.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/854be002da4cfac25a9c9cf4f8c7c496/muzas.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9f5156bc65b0b64183a14f4168e913a8/8646031593.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/1720755849.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/71020792145.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/xuletabolosirepexivefix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=formulation+and+evaluation+of+nanoparticles+pdfPDF 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_off0001858d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1858D 19940 bytes
SHA-256: f960eaa8e6c17814f72b1505b0a9f817a051574cbf4fdc10692552b4184f11cb
font_01_sfnt_off0001b730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B730 10924 bytes
SHA-256: 040801981f1bcab7536399419705df33b89ea81a2a35a3f34f5181fc668dca8b
font_02_sfnt_off0001d07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D07D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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