Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18211100335d178…

MALICIOUS

PDF

91.6 KB Created: 2021-07-31 18:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d6b8aff9b2f4d74b31e34941005c17c SHA-1: 69af340386587a0d542ca89177132aa68b79c61c SHA-256: f18211100335d1783be6591e560da039b85b8e300781db31ad586a1c5ee73e9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://crysiq.ru/uplcv?utm_term=how+to+write+a+television+script+pdf PDF link annotation
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/00ho8f0ht05nbn09mcvilu3dk7/guzularizomevetad.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/6cf2cbb91f87e78723ab782fd0f4e392/tejuwunemitudanuz.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee605cd39---fefefege.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/xumarelitavenilapo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0fa894e69---24993550269.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/balatamupovipotamop.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/b1ec659acac290e0c2baf079d9c413c6/85320173677.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/6653931599.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/6c2c8e849b65583aad5285f61ed3798c/wokopamo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a67b7af68---92258762852.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/dn7o92sjdae9o1e4mlpi4so447/96146597338.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/rqhi4asou6etk5tklrk87u6oms/44431131303.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084815fbc996---6180633455.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608f8692a4985---25273767795.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6f87e796d9aba97a998d466f4b873d47/jawuvagoteg.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/p69r5hhlldbatimgul4mdfgiug/95615251714.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/97563603252.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/galitozukofevutumev.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/41022259353.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/sao7sheil8ceodtd9gfjnjh41p/gewovakurusel.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/dexuzazuxog.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/48395222588.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/15491590644.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/16887883267.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 10756 bytes
SHA-256: 5163b9916ecdf4660fc70f775c767f1d5f674e46bb632ce2d6f5705f4590d705
font_01_sfnt_off00011ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 16956 bytes
SHA-256: 7c6f9e20961442dc3e8564cf67ab224f83cb0029f1b030d9fc24d1efcfdfa0ae
font_02_sfnt_off0001492b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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