Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd58432575036d85…

MALICIOUS

PDF

79.4 KB Created: 2021-09-06 07:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a501f705f98acd4f1d21a423352fc24 SHA-1: 404a08323ead7940d54d0648692b21976ba5bae6 SHA-256: dd58432575036d85ecd61253e4c46db6d49b7b459233045dafa27d3e8223f80d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier strongly indicates this PDF is malicious. It functions as a link farm, containing numerous URLs pointing to other PDF files, many hosted on potentially compromised websites. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt at SEO manipulation or distributing malicious content through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://www.multigacos.com/admin/uploaded/fck/file/80023063744.pdf In PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/79848336936.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/92470672218.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/3051543847.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/826e51c83b984f0180c5ac4f41c08ad5/disobenatezajawonokakisiv.pdfIn PDF document text
    • http://4bx.pl/public/file/59442898438.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089337073e8e---ruzug.pdfIn PDF document text
    • http://www.bandungmesin.com/file/denavipumulokos.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160787e5c7b9ea---34690762744.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d1da84a95---99553575367.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/fivaxoxanulesuzolapipufob.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb661f2d2d---7512950400.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/45918492143.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/xijabowename.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d01792a83e---jajokix.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c03c3c874dac83b87fec9aa9ccc39f11/95438651239.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/26q82886nmnn30al2r3oh2gctr/67487575138.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160841e91b6401---mododuwapinop.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/pusijemexomonove.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e74634153bf---dugedajisixamekakukusex.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/lokifezakekoja.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/720a74e8b608bd4db019fc0ddabe410c/tabotobupufim.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/19521534137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+convert+pdf+to+excel+in+acrobat+reader+dcPDF 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_off0000d305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 16712 bytes
SHA-256: 837a478570a941ddab3023f78f8da8ddc8eabb770dac305f88789766cdff4ee6
font_01_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 10828 bytes
SHA-256: d744fff187679cf508d29aacad50b6accdd052a7d4ade0249489bb306862e2ae
font_02_sfnt_off00011770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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