Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c42bf87a2325750…

MALICIOUS

PDF

84.4 KB Created: 2021-09-07 22:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd1f833cf203d8286a4dd0d08ad38f88 SHA-1: f5bc886d388d9a80e9056c15824bc251d7683b81 SHA-256: 5c42bf87a232575068839070cbaa146918634ba959eb08262dd0780fa4c3b84e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection, indicating it is likely a phishing or trojan delivery mechanism. The document contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to compromised websites or malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters in URLs further support the SEO poisoning or phishing lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://allytemp.ru/uplcv?utm_term=bronkiolitis+pada+bayi+pdf PDF link annotation
    • http://rajskiewakacje.pl/userfiles/file/33296326278.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/punuzotomanidefatanaju.pdfIn PDF document text
    • http://broadmoor77.com/clients/39738/File/86253845227.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/33863106188.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/1925216614.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/292334551476.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160926a4e11feb---15231040586.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/32614946963.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/zetonasudetop.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4b7d41d7616b48443bacd4905b2cf76b/53761620587.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/5789c10f12caa266d85c268b4f979c93/kusujenevo.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/ccc8c425a6edf116f869819a1bbf44bb/11597650787.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/11918453370.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/539aaf4f001f04055b703297d12fe4bc/36746946746.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/348596889.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zebadukuvevumebelatox.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/13600322126.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3c72ca535510bc46baeaec622d852138/89253365612.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/83298a8607becc8a6f290b667fdfa7da/57887546626.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/70263385245.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121765220d2e---janisuki.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/gavibinomarojezo.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_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 18572 bytes
SHA-256: 5b3dacb60a29dde9617943c054a18c1e5548996061a374183eca6815de776e78
font_01_sfnt_off000111b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CF 10756 bytes
SHA-256: 086cdd5ff8c2eb981f51cba81159b8a1e369c0031eedc12c2f1e1b3396643d23

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