Malicious PDF — malware analysis report

Static analysis result for SHA-256 144dedb415b6992f…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 01:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8201a7708561c933bbbeebc575db07d1 SHA-1: 63df1f442e42b8f43be12adfa55f79f845440497 SHA-256: 144dedb415b6992fc60896326798e08afaef637077fad3405a3821309c4f90fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. While no scripts were explicitly extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to manipulate search engine results or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ytlcases.com/userfiles/file/71067453514.pdf In PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/69rj99aa56ntug08jo5h1mhkd6/54870681407.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/pebelonu.pdfIn PDF document text
    • http://standdominica.org/files/files/suvigamebapokabozopabeb.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/22203919516.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/69b0d71621da9a507fbef1cafc89737f/15124828671.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/2ipfphdvo8u6q8p5n4pij4bmsi/24798356088.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/68094324236.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/zirowiwemotiditoxa.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/wixuxujatofetolef.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901fc9d78ea---robuka.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/147e312e67cb065de8b716317d4943c4/8736949385.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ue7llhdphacl5qff72eupo5877/xonasijumoxevifuv.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/reratimofufidosuxejaroxup.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/zelidonejed.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/01194d17086375222ffe0569c5abcfbb/jezuvedaturoxowuzup.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e954aee37---84468519488.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/42499156805.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/56902988243.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/69520923759.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/75432258663.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/42709906904.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021082101075896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=rexroth+industrial+hydraulics+manual+pdfPDF 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_off0000bc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 11244 bytes
SHA-256: 2044a706bde109ea85a17379d787c397b5f9b3f5bbd3d95cfd7eb98365100ec9
font_02_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 15996 bytes
SHA-256: ec016d11722c6b1d33a4e0ce4aea4cf814c50729a4cfb63ad262afeb46047d5f

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