Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58d3b9e43eabb4b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 10:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3562fa20d4610bb7b65632a9f6ee5c69 SHA-1: f4652f7bcbbf2d9eebaff80aa6f4b63211174d61 SHA-256: d58d3b9e43eabb4b474d7b61399362f8854fc5a0863e2ecbd5c2e510c8ce116e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final malicious destination.

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 https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/3c7009fa6e76b5d3cc9ba5d8adc52137/sepirixefefuwis.pdf In PDF document text
    • https://espiber.cl/images/uploadedimages/file/buvakikajozuv.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/960685ce51e9858de693e9beb9b6ed59/46352822965.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/xexewonamoxujazewus.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/7ip59u3dtrhldc0s5l765mtr10/99599530199.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/47249235086.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e9bb65aa11bf8c54844cc4fbf4dcfa8c/kenir.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/13128872462.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b752d16b4---linogidebu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607be00151762---kobufena.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/zakaf.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2e459b6ab2bb38d4db70d911636ce047/69063286529.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/86761740594.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a09f2e0479eaf9e552707e98d5f42bfb/15487275635.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3e4911b7---gafekupajalatazabapera.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/67931093934.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c3bda6f26f5f0d3978d5ad9b6a771c9b/81800812315.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/mewitifetomewefaxozuwod.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/803be31461510cea019cfd8fbf00174b/noperikija.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/58738412366.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4f3a8c1abac7ac53cb76ae1d0cfdd53a/fomazobipovev.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/83256684439.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e71ad8a069---berezowavaxe.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4p2kfehvksfmf9euipht02s396/tixoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ankle+block+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_off0000da91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 17772 bytes
SHA-256: 3404e5804cfe5de2ae666aaef02bf142214b1e7e5942b51f3372320752aff328
font_01_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 10204 bytes
SHA-256: 4e1120766fb067ba19624f6ceb6fd03d985bb2f6285b581d44d4977aef712d85
font_02_sfnt_off00011f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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