Malicious PDF — malware analysis report

Static analysis result for SHA-256 4205d864ddd6d066…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 17:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0b9a0d0851a7a1e6d58bbdb80a674cfd SHA-1: 84810007f0a6ce0f07dce9176609883f162aa333 SHA-256: 4205d864ddd6d06679e619b8ee36a6586566658389e5f1bc1515a0c57a2a5e0b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. This suggests the document is likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gulfcoolcontracting.com/uploads/userfiles/file/file/49538429579.pdf In PDF document text
    • http://habitat3.eu/userfiles/files/xijewalotajiwogetojawit.pdfIn PDF document text
    • http://progetec.org/userfiles/files/22005464900.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074c02937dc8---xefafudulekemuxix.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce1c96d2f3---felafitopim.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/fidofugebasitiput.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vomibojazanugevujotir.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/kubutevinevowirokafize.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/619bebaf77b387422f076c6069842da9/28439524445.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16120176904ca2---62627876853.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/kodobujusinumi.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/tosorodaxosalumajadi.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/41892297129.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a6a3e1a6b00356709897482267f912bb/66736519253.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/femadogiv.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/piragajito.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/65800418973.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/c3fksj7aukop0187csf993ovqj/batizagozelugoded.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/guzajudidewavojofarof.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fe3a56e27d3---79091698099.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8tb0o7vjl4urc7m2k06v0u3uk7/dojexifalijigeput.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb59d51ba0---46579214699.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/48845644689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=lcm+of+8+and+30PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 17196 bytes
SHA-256: a07614b094a6055c29816ba04cf4085f4fd17a5b8f22520050f11fe58d73caea
font_01_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 10460 bytes
SHA-256: 81b837b5020cae2ae49fcd998aa2a67ba03aa6c971fcf2ff3606ba5d82595b21
font_02_sfnt_off00011d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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