Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c3f8e86ca7ece5…

MALICIOUS

PDF

83.8 KB Created: 2021-06-29 08:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8d1dac4faa56b289425b89c40e84575d SHA-1: 77a6cc16682e4dd9611907bee81a8ddfbbe167de SHA-256: 58c3f8e86ca7ece53baa1f94ce21dfda7f6b6207e7a62ee9da43115bea109dc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://garglob.ru/uplcv?utm_term=print+paper+size+in+pixels PDF link annotation
    • http://gt-outillages.fr/ressource/site-image/files/dokexiwiwixulovatemenovi.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/xuxetasewotez.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nurosimuzumo.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/51710283593.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/r3v1qpb7q2n8v7o9n5hhs1uvfm/58228710641.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4hv11hkgk3si8t14cn4e7gtlj7/70515454832.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/266dfc5c68b15d97162fe90eff82a454/16091272808.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160943aa322cd3---lomewifo.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/lujawi.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/gekopenaruveva.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/97939478914.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a6beb04f709---jafowunugugo.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/ug7l60l7p99d5kag5qapsj8hqm/11014507955.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-19/20210519002619632352.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/kepakujokedasajemakudipa.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/b9b79b40f8bb28de5541a4c7557783c8/1029510704.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb4cf3047---56709451038.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/1b0a2d5bb951cc257b32d5eede40e286/82032180249.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/fd7e134f90f6fd76ca477e20c8b4bc83/53751252511.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c07c98e7bfd6aca351cf6a7516c1eb16/gimatebamemowasuvovepele.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/nasosimaworavatuvenunulan.pdfIn PDF document text
    • 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_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 10288 bytes
SHA-256: 69bcb32e9ec13f5c1d63abf1c397c0c2ebdffa0352d51c05cdef26a1673c55b7
font_01_sfnt_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 17584 bytes
SHA-256: 5dbc9c3240da1b69ea448e889b948bf694efb63301698bb93d1797481f6bd97e
font_02_sfnt_off000129e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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