Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e225d3b3ba694a4…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 00:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9e38f4ff93f450a38bd12b12b928b57c SHA-1: e851af64f483ad6e1c49354ddf64a4f2e881f6f7 SHA-256: 3e225d3b3ba694a46eae18ad8a0910d878603fd8ee6223955c8a7f37be53eaa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://zulaikhatextile.com/userfiles/files/mobavazimerugikujo.pdf In PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/22332aab20c80890fae61c8f013822be/12088955206.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/pimijudoraj.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/3390776615.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade00684882---bepotofixefamalo.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c43b63a7162---58373244938.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/10039156225.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/kebetapezodosikuxit.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/37437760386.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099c55755dd5---lekubutefinobowonipubemox.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/vudobaretexegawafuxakixix.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/686164fcd351051fa0d0ae42f6c91bac/59157824589.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987f668e897---tekonaledo.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/65431190567.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/da47bc7b73fdc11ebdb32290327b7c34/590689908.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/ponesinaposawowarawonatav.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/dde0cb7549f10964e4baf3336ef495ff/nopidusabetiruse.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f24bfe3f975669c16b92655d1c9c3d7e/ladasajezomasexenugaju.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/34693817177.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df6b3765e6e---50989413169.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/4qmftn1r4kgclsdb8um4m4ql8p/favabovetexiwa.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608675998a15b---28385649753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=examen+delf+b1+junior+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC762 10900 bytes
SHA-256: 7743cbbd010a3d35a06be8eb5d6678d43ff7a0b9838f968f242c6353891f039f
font_01_sfnt_off0000e03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03E 16352 bytes
SHA-256: 9c09c88ae8c16bff84111354316359d021997fb4aad4f8972c10b81994a3a1b4
font_02_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 23852 bytes
SHA-256: a865e1bfe9d4360de169e258b5985155c74147a419ac0a7bbc9f7db1feaaf35a
font_03_sfnt_off00013299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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