Malicious PDF — malware analysis report

Static analysis result for SHA-256 0633a02df2fd6c12…

MALICIOUS

PDF

86.4 KB Created: 2021-07-31 00:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee21932a62615c0f0c2eeb1c07690791 SHA-1: 399c09eb10a005cb0d73c7b9a9e0bdb2648a0778 SHA-256: 0633a02df2fd6c126bd71439269757e97da31ceabb3784243c23dbe58ab4aebf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to distribute phishing content or redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d115b50b48---zinan.pdf In PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b58b9a74f---losarazelekakuzavom.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/e299207d0c98ba7dd723c96c5120fbf5/25000736651.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/8evg65f9l1ta522sq7bq9j78v2/12915829322.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/eccf6406dcc9cbc1bb45b15352878f01/99896416132.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/58684853370.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/givilisodaxisero.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5b9b937aa---39872487484.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/a0eecc045f35e15d1512995759dc3450/55563111530.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2d5506834---waxukigirikimeximex.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/80478177489.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/3288964315.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/36996247056.pdfIn PDF document text
    • http://jar-ted.pl/file/6567203515.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/38510425079.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/tamuzixatife.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/nulasanekividumek.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6a9073226---75527747038.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/matizukekapitotodixolasok.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/40197470239.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/jutulolimamelutugikowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=courageous+movie+free+online+streamingPDF 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_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 10752 bytes
SHA-256: 8ba418205e1e1dcad5e3a13b7da988addcdf4828bd72419c0cab478a39dc3a15
font_02_sfnt_off0001206c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206C 16984 bytes
SHA-256: 0592661200e2fade69d669bf2562f8efce8e377862621e9913f71af5060733c9

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