Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a5cb96acfb6913…

MALICIOUS

PDF

79.6 KB Created: 2021-06-20 05:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 226294d885448d28c29116249c074f91 SHA-1: 4cf42f8e99e7b150c63cd5c0f73f43b37f3f362e SHA-256: 14a5cb96acfb69138f8410b86503257d48c7b3b6b7aad7dbf718f83ca0ab3b3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9998

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://smartpaintingplus.com/userfiles/files/3817631687.pdf In PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be71f04d50a---dizuvotigosuxade.pdfIn PDF document text
    • https://medtek.vn/storage/file/rapaxusisulale.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f194e8f0f1---nasotagakisogodupiroji.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609413d417ff7---57992587267.pdfIn PDF document text
    • https://tipresentoio.it/images/file/radepeku.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/9qn0ltn9n1n2tvru1dau3djhtu/85061008632.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7d0170818eccbe1b77356d26dcc06b67/wekavosenugaliwat.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608931eb9dcca---71701119867.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160853f5fa81d6---vufabulujipi.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c620f19fc2---sajomepopu.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/212ab5a09ff10599e71fac4efbdb0ccf/84946079423.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b3be56e6a---89574360280.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/12e054f63014c0f9472c5825099cc237/vaxivedakafisetugosabarur.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/80867846799.pdfIn PDF document text
    • http://ekotronic.eu/files/file/nagefamej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=stiffness+matrix+method+for+trussPDF 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://scripts.sil.org/OFLIn 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_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 5288 bytes
SHA-256: e1238ea7f5fe63eb7fbffebfbb4e3e5a80c48782b4a50daf9b4c05c041d67376
font_01_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 11500 bytes
SHA-256: 5ecef57a8d355cf03c516e707363b5fc224dd0a6ee62c234d08cebbb1e6041c1
font_02_sfnt_off00011c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9D 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550