Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdcf5a148aaa2b2…

MALICIOUS

PDF

77.3 KB Created: 2021-09-03 02:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 926201e2ea01580851e486c33d24960e SHA-1: 6558b73c4b2dc7b275cb23f336880d740bdcb777 SHA-256: 8cdcf5a148aaa2b22e7a551b6bbcc4f71860044b16c0f4168bde710f91c3d602
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b95d2617690---kesudupafoforaliwiwakotir.pdf In PDF document text
    • http://alemotta.com/resources/original/file/23135393268.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160712291db6bd---11401959939.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848173a6059---77142453455.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe88f899a3---92971060430.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/29185832614.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/bufapefurulefenakevizin.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609751a5db335---dikon.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210703020108_c2VyaWJhd3VqdWppcG9ub3A=.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/sepizalufulajod.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a9f71a5b1---12314584556.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/talimelubobatonep.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092809890f02---95028891629.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/88af1e48ee6643a09ded4a538ef79628/63174328034.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/molasapewirosokatujovisa.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/vidivomameselofab.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ab2uvdm09v71v84rnqas5lmjgt/54996110847.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0072945492abe8eabeb3aebd052732ba/tonaduwumotolijugawad.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/80896692171.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff38cb9208---narev.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/17428913417.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/mifive.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc516952bb---8132990845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=behaviour+modification+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_off0000c9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F2 17308 bytes
SHA-256: 157cb0707f8a85934765b076e15a2daaa65003b7aee0265d7077d152925bc499
font_01_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 10892 bytes
SHA-256: 7b979e4dff24bc6b3709eda1cbd2d6e35d12bb2f030d7626f4eeb21881de0175
font_02_sfnt_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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