Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e118529fb217530…

MALICIOUS

PDF

95.6 KB Created: 2021-09-06 06:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 536589d7bf86eac93aa87ab032a18a93 SHA-1: d64412d83906ae1f15da49ce38df62c283793897 SHA-256: 6e118529fb21753095270ba2c1ab3c8b940a695b0d2779d784a51b58ff89a0a0
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The JavaScript likely facilitates redirection to external URLs, as indicated by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These external links, many hosted on compromised WordPress sites, suggest a phishing or malware distribution attempt, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 9

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba03c885c6---moputalabog.pdf In PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/95900721006.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160985a990090a---10142100093.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a26a15c74ffbdb386c67b1509dcd89f9/nifetikuwosigitofodu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/5648d1555bccdf778aaaf64778739a34/fijodakazanukil.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611d6da61f510---99404008202.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/49998332337.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/4635176813.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/wajinepirer.pdfIn PDF document text
    • https://luminex.pl/upload/file/vuxotubixebogukewez.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/62969858808.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/54568223213.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/30795408696.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/74857256071.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/1001435549.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/9241300bbdee415df0c89bdd4e441d49/4963346650.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/73378939731.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/zumetibadusugesaguvik.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc50fc2a29---35437579058.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/momopewukobigovimamenom.pdfIn PDF document text
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/52067023672.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/kv5h6h74mtl71p6sj812cd7qd7/revuwulotepizefomolix.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/79195040740.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/75024219970.pdfIn PDF document text
    • http://digifast.cz/userfiles/boniwapewokutaxej.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/8aea91a86de6aae84f28d1633d9fb60b/98031512193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=chrome+headless+print+to+pdf+optionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 16644 bytes
SHA-256: c85141da86f3564ca7a70992c86e0fb096b86d1724d331b1b8106f792f03d05d
font_01_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 22800 bytes
SHA-256: b7d57526a395932b8e8517e5a3faf8b548acc913b357b6626485a15ed98396e3
font_02_sfnt_off00013f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001575d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1575D 10792 bytes
SHA-256: a3d50ee4cd72b3de619d02542e5327efdcca4aa063240f8c59de069262f66bbf

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