Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a73738339ac4240…

MALICIOUS

PDF

131.3 KB Created: 2021-07-07 01:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b6b69da001d640052c1b40ab315b0ca1 SHA-1: 03c31d9bb787fae8e6c6421f0e53644a5bb50e33 SHA-256: 4a73738339ac4240d509a80507fd5db4f53e1dbc45c2ac91a764b67d16b67de1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and compromised upload links indicates an attempt to lead users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://gangnampools.com/contents//files/93731979447.pdf In PDF document text
    • http://co-wemart.com/careeruserfiles/file/16298961396.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/83823795437.pdfIn PDF document text
    • https://fallsplat.se/file/vewijapi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/eca017eaca31ca9164e5994415abcdf2/10169445908.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/nbsle6n48n5sue8o654026mp80/biger.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a189685873---88734868005.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3f038d3d3---66515495833.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/25364875890.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f24bf99e47---67617385194.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082265498040---73771480638.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e0f6b64a3f8cd5715833f086060425f/jefomedugijomebene.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/safamipijetasanaxobovor.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/69233973608.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/zurivebejuset.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/350d2f64bc2d44f84698cd6a451bde51/56492449921.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210707_055004.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/13750380530.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/6201941893.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff43b60565---kaxovusixupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=in+an+inelastic+collisionPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17525 25372 bytes
SHA-256: 241e81248673424419f5b6f50b4cfb52cf887a62d5b7771bd2e65a4e72efb69c
font_01_sfnt_off0001bb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB3C 10076 bytes
SHA-256: 1536c7b13c8d4f318492813b8e42f53522d74fb346ada5bbdeb2d5664d5fdf9d
font_02_sfnt_off0001d1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1C7 16236 bytes
SHA-256: 9ddd0c62f36833e5552b1fc6445e8a6e095a26a2f21427a1bde6b3b66b2cec66
font_03_sfnt_off0001e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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