Malicious PDF — malware analysis report

Static analysis result for SHA-256 578c8f06b291f6d2…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 17:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2061542805a5c1eef929b84ecece510e SHA-1: 4f3d4aecb8516ac71b9fba4ce161a49fb11bab74 SHA-256: 578c8f06b291f6d2fd61f8fe7c822eb23099adb44a5d807fb2178dbba166bf63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs are present, some hosted on compromised WordPress sites, suggesting an attempt to lure users to external resources. The PDF structure and embedded content, though heavily obfuscated, do not contain explicit scripting that would indicate a direct exploit, but the overall pattern is consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=december+2016+printable+calendar+pdf PDF link annotation
    • https://renault-service.com/userfiles/8527575047.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/10e77ac874b5c8662b80164a606aa87b/94142719147.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fitewar.pdfIn PDF document text
    • https://renetravel.ro/images/files/mupomazapiwozisokurepod.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/33777155536.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58c478b474---52429347015.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b897745d7b---dunijalaminajemewafujij.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b3be3a782---92148778314.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/20631536922.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/76716705962.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/352b9ba9b3d538bd772233a5bcd01324/tokokimenexomuxodimopa.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/69306839700.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858f1a8406d---jazafofogajatugelasex.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/jebedabaxafupotab.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/eb8e7f7fc9596c7e7d15ebe02d8a40a4/zejemazesukin.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16079b357850b2---futuwoziso.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/bujaxobufazax.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/00ge7ji1lei9dbbjjrv850kgmc/68284751498.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/sotokij.pdfIn PDF document text
    • https://mimpishio.com/contents/files/niken.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/39312250611.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/kerezesiroliti.pdfIn PDF document text
    • http://poiskvod.ru/images/file/sibesudega.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8e2e91f9e68f9c02aa1423a9027dd6bb/83901561537.pdfIn PDF document text
    • https://tckontrola.hr/files/36266824025.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_off0000dc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 16472 bytes
SHA-256: fe0a64863db526b612ff715b9f8fb7e7f7cbe5e35906041495ca45975e706d8f
font_01_sfnt_off000106a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A5 11096 bytes
SHA-256: 5bee1d2484386737bef21b55215d614b10b64595540a9f89c358141ffe0d7104
font_02_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1