Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6deb8d452f54a89…

MALICIOUS

PDF

94.2 KB Created: 2021-09-07 21:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08a6a2cc129ff9fe5272ba0405647bfe SHA-1: 636a679c8a674655feddf4340b50a6143793c882 SHA-256: c6deb8d452f54a892f6c7977b4924cc02ac89f073436bf87213f6b561cce90f4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sk17b169c9792nvjv2uslq4er4/31239152403.pdf In PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/61399513641.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16091003b232a5---fajawazizula.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/68800279932.pdfIn PDF document text
    • http://akhsmombasa.com/clients/861898/File/kegojogaligevumis.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/kewisiso.pdfIn PDF document text
    • http://weldingplaza.com/files/file/7574008522.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/navesixerulizejujetagos.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/rojowugitejovav.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/1dbe28b1357baf8d8b915b52388211c2/55109756083.pdfIn PDF document text
    • https://aaaxxion.info/images/file/lirufitu.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210719_AB52A6FD160F2AE8.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/goveg.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/lbks1og4o4jg5kjj3hr285ts66/jikejuj.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gulokugeminafakoge.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac5c16ddd---16572851880.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-06-14/images/files/tolipakodezuvis.pdfIn PDF document text
    • http://gabortech.com/admin/file/57898992315.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/25778092531.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/68245383887.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16076dc6e15ca5---dikenoredider.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/77202071406.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/nodovolupujibobuwovum.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb81cefe58---kiribamazozudaworepolite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=new+york+state+of+mind+satb+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_off000100d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E8 21176 bytes
SHA-256: 635432df9e26b67303a6947c3bd4d8df9d01228f9b2f8b42c0c128ca3e5a821b
font_02_sfnt_off00014f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7B 11020 bytes
SHA-256: 208fce13ea26d91e096a46561124d403e7cfea5f76584294919668f859c3ce55

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