Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f0a5a3ba801312…

MALICIOUS

PDF

80.9 KB Created: 2021-08-05 21:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: ecc7f71c2bc43c791858564a41cd1891 SHA-1: 6ae50e3f6980036731e6399ce7cfc19b7b33f603 SHA-256: 48f0a5a3ba801312f61e419793f50bc966ff602e1ef1d0a5c6d5c7aa6ed6758c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://bestbuyfromindia.com/userfiles/file/76932297757.pdf In PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/cecb066e33ee99f0339a709433c6f18e/zenirumawinoxi.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210624051350.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080296e0f975---wekotifozusesobizuveman.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/devid.pdfIn PDF document text
    • http://samtekelektrik.com/files/vasexawijazugomalakobeget.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/7868544484.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/59844183570.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/tigumepupixejukasa.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/47784151320.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/poworojalasama.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/567314578.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/demize.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b421d2349---67604550893.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a5b0d71e9---xiwagiriwofeje.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/41759129601.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609273e4d07b0---siraburilikazibawo.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/tevageragenuduwovosopi.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/disijogojoxuzujemutura.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/53084896691.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/28357319830.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d9ee420bba4bc1571132940c7eec9013/teporurirewovenaporawowus.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/107324718608b8df38d9b8.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c2630c95c---nunajoluzoginor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cub+cadet+1440+parts+diagramPDF 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_off0000d5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E4 17476 bytes
SHA-256: 03fcdcf4e5505ef12e8b9481a88165ab379c00b7c49a4e7cc5b2a8aec04dc6bb
font_01_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 11108 bytes
SHA-256: d9acb538cb3ca1e0f77d4397942b6dfd502d795911b93bd46be323245c868f53
font_02_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1