Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbfe89f35ef27b7…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 04:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10cec398abac332a70b4a17ade7d56e0 SHA-1: c124fb17fe4df796739ad22742001c2363ac490b SHA-256: 1fbfe89f35ef27b71b06f0d21de4317c40c604382755416ed318c09c840348c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to compromised WordPress sites. This behavior is indicative of a link farm designed to redirect users to potentially malicious content or phishing pages. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://crysiq.ru/uplcv?utm_term=flirting+in+italian+pdf+espa%C3%B1ol PDF link annotation
    • http://nct-vn.com/userfiles/file/gidexofitubo.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1a1d93ff---vibebuluseroxefotebujeju.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/48110773301.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/sokozupefisawifow.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/2424611077.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/seziw.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984bc9e89ca---91581148636.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0qgk2rol26kfghbuuih53d2eeg/jariditasimijijapeguro.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a95a46b81fada86361db931dd47bf129/jokazizubelapugopoja.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/152ce7699dd25cd64c9f6b207308c0b2/44978662003.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210723_51EF913D92103C30.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/77932185080.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/webizosivapikuz.pdfIn PDF document text
    • https://signika.pl/Upload/file/27853462933.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/lunogavowuvusedinoturir.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/uf6l2a44sqeqt0tlrfmtgqsa91/29590422204.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tovutu.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/rasakikidojomozitaxek.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608677ab46ffd---1594827596.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/37023227521.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161191bde077ad---bimoposetedizima.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/30774108416.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/33509409512.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_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 10856 bytes
SHA-256: 2ab4842ff8b1d2ab137c41879b71901c1bc89947b87ba72550599ceb460c961d
font_01_sfnt_off0000fa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001123f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 18644 bytes
SHA-256: 7757ddf1ca7b5eeff387d57caf73f8ee5f2756235c295ae88fa169bd9bc6ba1b

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