Malicious PDF — malware analysis report

Static analysis result for SHA-256 1986058eaba45af5…

MALICIOUS

PDF

122.5 KB Created: 2021-08-12 02:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d92d7edb3be34d316f95ee3d76cb6301 SHA-1: 58082fedc031124b0e9825ee77d6e6b875416c02 SHA-256: 1986058eaba45af5f7df763c334ba9773f648a51a0d67f173db8b9804b8cdcf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and the presence of multiple unknown URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160700eb6dc5fa---92289494811.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c419bb143e---nofozurefogagozajudadi.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0c9bc486a---nunidukuzemizekopukipeve.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bea490039---32333098700.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/64588141245.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/62655038227.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/nanowimeto.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160797e7b8b109---nukesirizuzumudopukikovo.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2cf586b9ae2edb49a5f9b79260ed0241/86220382175.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb689f97583---lolowotoxevikapifat.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/3d8f8de2041222ade99d94e3661799b3/gebonavi.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j390u0ulqhibih1qbaa6fmbm33/bilitutozune.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/43814147245.pdfIn PDF document text
    • http://ministerium.pt/files/33325767234.pdfIn PDF document text
    • https://xistenze.com/files/files/tesolune.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ce3c0ef67833a0c528a7cba0b7b77291/xikolus.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609981659b085---49681689872.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b24cef799ba8b5b5e82b8809d5aecb63/84781156456.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/fowoluputabitak.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/19864703950.pdfIn PDF document text
    • http://vieclamketoan365.com/upload/files/55566763226.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/53a1db4f90dad591cd0920a0f8b9f8d6/92942530531.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/b82bd1e8d330ad9679b759a1031c6485/wutawofogifutit.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/wolovipanonawugabax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=higher+order+thinking+skills+questions+pptPDF 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_off00017a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A98 10840 bytes
SHA-256: 797f410f0d7353abfc82984d287bc20695ccdd2e1b25ae07a90490e1f4d5fd9a
font_01_sfnt_off000192f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192F2 18224 bytes
SHA-256: be23cbecc8b1b05fac95a1ea2752361df128ad047ccf5843e709f143d9d69a81
font_02_sfnt_off0001c30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C30D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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