Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb57ab745cbb6c43…

MALICIOUS

PDF

94.9 KB Created: 2021-08-27 05:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a253c5d1a9b2974aa5422031cde2b0e SHA-1: 1b2c96825ff1e8cfaf465ab17c925fc90294b8b8 SHA-256: fb57ab745cbb6c43f9bdb0ea74d6d1e787b872c1bd0690c6e68f4e1213db96cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised CMS uploads. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=sop+for+ms+in+computer+science+with+electronics+background PDF link annotation
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ik1v8a3sjj24ibtu0f9qeh9cks/82076950633.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/119581517.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0355a1365e---38761040051.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/44b42bac46fbc2eab24de5a8528c181f/sewiguxaxovewusaru.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607d93806c983---guxepo.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/24697312113.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/78849461184.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/gmd7togogdodja516k8lj618lk/47118889683.pdfIn PDF document text
    • https://gdaniec.com/upload/files/68743287399.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/9934382362.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/38297952105.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/legipibaxur.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/zatujetaxuzaxoxizuzoda.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbf4038d44---15444265717.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/39892840859.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a9d7c54d62b93c4b54cdcd08b85ce6dd/fuxum.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/82269549608.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/nuwawiduripevu.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/80a951cc7c2bd6cf242df9c88b4153f4/vuxizep.pdfIn PDF document text
    • https://peterdegendt.be/file/taxor.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/47536256784.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/kososopibulenubamepu.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/39096059072.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60b9aad7d1---9774628456.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_off00010c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 11560 bytes
SHA-256: f96cbb9ee19a46759176330ac49b7ef012de3003d7c8e2fd5b8be9ca110f78a7
font_01_sfnt_off000126fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FC 17048 bytes
SHA-256: 20921383fbb78efcc7cc8bd68248700979c77e3e61b98cd3dacba8df36ea9ddb
font_02_sfnt_off00015375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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