Malicious PDF — malware analysis report

Static analysis result for SHA-256 4041f0ecc314093f…

MALICIOUS

PDF

87.1 KB Created: 2021-08-03 23:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21e06531c04dc1aacc7979b7d14b73e6 SHA-1: 9bade40a266e60befec490b112de956de507a2e5 SHA-256: 4041f0ecc314093f9b12fbf803e3abf01ed05d7f936fb3f330f2dfc5f0af6a5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=how+to+put+bissell+powerforce+helix+turbo+back+together PDF link annotation
    • http://racecross.com/upload/edito_fckeditor/file/pupefer.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/junukimetokovujaborimap.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e53ec208a4f---16596314524.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced34f90044---6179620211.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/vojeridag.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/13880467226.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/54631612208.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/vebudepexudadidad.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160750f764caec---92905184420.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793e792ca0a---21034025643.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/45265216130.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210605140103513.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/33314324022.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/37572315738.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/26607442853.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/birada.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/32493243696.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/zatabi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a001373d6---90558662416.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b7f277106853b73e57b1ece805e85190/2721305015.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/kukememajizapife.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/45537633617.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701283b3ce2---basikovirulusefidenogom.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/45600690511.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_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 17764 bytes
SHA-256: d66934b14efc34a229680026568b5ace01da1604fc90981e05ce8d04b4aab30a
font_01_sfnt_off00011c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13454 11164 bytes
SHA-256: e965d4e6afdf1f028e7a056dd23833aa0c0ce958d18acdce9c26ab8b083d521a

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