Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f03366ca823dd1…

MALICIOUS

PDF

109.5 KB Created: 2021-07-09 22:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 96ffd25ebc2980e65068cabeb051a11e SHA-1: 5855a8c113d7d16674e5700986c295e849eb9e3d SHA-256: 90f03366ca823dd16224bb1dce94c88c1b8148e9547ae175e565023656ef877a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to trick users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=tom+clancy%27s+ghost+recon+wildlands+system+requirements PDF link annotation
    • https://mygoaltv.com/ipp/images/uploads/files/kazozejumal.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/juwazusagisonunuxilelire.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf4c31594---92114651505.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/24770059631.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/vuzute.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tvdhvp2gc4pl42sln0gdlcpi8k/46547356340.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/4580769713.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16092a98e3f336---sojuduzujis.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0oo8ds7cmonorj80b0bd0mosd1/xobuguganukirokes.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/98284312511.pdfIn PDF document text
    • http://dzbnf.com/upload/file///48138944627.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c180be399---52996042276.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d7ff84806---82816652518.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/6936aabdfe49d36665d3c64021fba988/tewemakinonalurifala.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/vogiz.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/040a80accc533235f2ab890482080ad6/87741288205.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c4cfbaab26---muraxim.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jisavizedokexil.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/wobuwekimor.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dcdcc873---ziforiwoxilirilonugafi.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762856d76d8---53145850824.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c407670b88350815064512b450a16da4/zajas.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0D 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0001418c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001599e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1599E 20744 bytes
SHA-256: 63fdb4f43f8469d127a2f055bc8b5a96eb4ebf4ac118c9f3ed675834a7350f92
font_03_sfnt_off00018e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E0E 11260 bytes
SHA-256: ad59a00b92ae01f9ba23d082e68250e57a6041ded2b6d348bceb96c472912f61

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