Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8b6328bd3afc73…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 00:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 590ee9ba9e22f23b84beafa5a1819249 SHA-1: 453414bb323bd1c04a469fd6c3cc705bacf4960b SHA-256: ec8b6328bd3afc734e7bb4a8d80c08ccb4b384a04af2569edc2750f687ae37ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious destinations. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4ec2fdf2---5099145129.pdf In PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/68774957785.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/69175045937.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/400d2fe345b4483f850004f1631f01de/jevetuxisupozuweluru.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/b72c1b9a86dcbd21fde208b1ea0da8f5/vidunugipem.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/riteligugakapomas.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/29291107928.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/1792o30v4g1asd5jig4d27np76/69218201395.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321add54b47---19686909016.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/35812465603.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/bejozufix.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/33c9555085355091b559cae1e6f5cb12/25817604225.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1ce523e913c79cdd0f565e4ec9e91615/11330076282.pdfIn PDF document text
    • https://hoalavender.net/upload/files/vazabiribifilonororog.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/sonero.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8962fb73029a8efd8ae1ee68a6f0eec6/bogexojowuzuzovutupilar.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/885e529e30c4b85ede2329783cbc1d58/50291020029.pdfIn PDF document text
    • https://www.crpm.ch/ck/ckfinder/userfiles/files/99677526762.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/10124181973.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fa040af2d5e2bcfe556e7f63bb56761c/jojaliwetubekijunagatukav.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/89430519156.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/8433239356.pdfIn PDF document text
    • https://penzion-palice.cz/content/pinadelujivakuxogetaguro.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/wajadurexovaloko.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16083a7c26ac93---15466278091.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3ba7b8fc---98047281585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=free+download+quran+urdu+translation+kanzul+iman+in+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_off0000cfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA6 20636 bytes
SHA-256: 30fb43a365f2ae7a80212df2c387db8125b3bf6e356911e2be13e5c241e6775d
font_01_sfnt_off0001049a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB1 11120 bytes
SHA-256: 5877eaa488d2b46b21eaf72c63dd4a25742834870c1aebffa407e8b000ab0fff

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