Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ecb7738419ab9d…

MALICIOUS

PDF

85.9 KB Created: 2021-09-03 20:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fce77593d828ff0ad322339019973484 SHA-1: 2d11b0660198afb1a2980d3b8cbb2ad6d59a05cb SHA-256: b5ecb7738419ab9da305066987fdf31aabe097784ed85acd9d9fbb2362026fd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e65e3d91---vixutofimibikesipagive.pdf In PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/78aa29ecee817c8d460c2432c9bef171/tozupunafafibugojujeb.pdfIn PDF document text
    • http://chromavials.com/d/files/patilobanabami.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/b50fb044451dd7f69663b7233ffdedf7/gakasawezejikidoxoleju.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/90ddh2s20qn7dbf9nf88s79772/41787183200.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/kakoniradewival.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610e45ff4b999---pikubowo.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/binaritagebaxutanotodag.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/71657691787.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/9b98d18359fb00faa18075b1c9e50374/sabusuletifanusunabi.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/6869269444.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///zogabadasemajefiwebabakew.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/16163520090.pdfIn PDF document text
    • http://ipublicity.cz/data/file/bawefaviwelaba.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/konaborujepiwavi.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7ed2310da11256bcdb520a03866e2aec/givaketutafu.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/notuvagolixedewavopar.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/nulurupaluma.pdfIn PDF document text
    • http://lucann.com/Upload/file/gamuwederifaxifo.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/tnrm5e5emq7fkt0r74utmrdlv4/kabalogufi.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/30421419104.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19789861129.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/1rvhnc208gk2j3156023crpdtk/37317164630.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d956d6af2e7b45be1f6acba4675ca350/navowewofukobixekujidu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076862e2f29e---pevit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=piano+concerto+in+a+minor+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_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 18932 bytes
SHA-256: 4684df35217dd2ab011ad5a6231eb1df5c065fcfc83296b4774e70890f75e4eb
font_02_sfnt_off00013189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13189 10568 bytes
SHA-256: 0a1655e320838f1f5cb3dfc03129504f42fff5624c84c04906b8f4d66a586e76

Open this report in the interactive analyzer, or submit your own file for analysis.