Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2697e5cfadd4164…

MALICIOUS

PDF

88.3 KB Created: 2021-06-29 14:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 05e58d389b7f667d7d7ddb91f09171d1 SHA-1: ad15f338af05449abee0e92aa1ffe4da80226a66 SHA-256: d2697e5cfadd41641c502b5511a1bde23bdf8fd37afddbf87ca549c6d41e50da
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the heuristic findings and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6dcec4288---korunarakujabon.pdf In PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16098924044f0f---46038337636.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9de54083---49519948088.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/bufigovajetugidaxowowimo.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/sinekenoro.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/9e5feb47a1dd13fcb5b0455731fd574b/73758684614.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a9bdd01f---fuxasozosupenasibit.pdfIn PDF document text
    • http://fxmeat.com/upload/file/8fbc3ec5ca04ed58cf97a7903eb591be.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210627082841_204o3a.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/8eb38c765571e06b8787118662dbdfc0/zenobodelujomemovawubujaz.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8981a3bee---bexinilerowusibadowatage.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c57ef3d2c---40125866069.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/zeropowomexabo.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/43fda330279179ce6dda068c7136d066/65774352343.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/pe6fqm5cg3gbrcdllj55pcdght/fuvemerojidunifogigopazer.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/buwadexatojoluboderonije.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce34d28b1---rijojasoraforet.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/xaludimejejovi.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/sixakoz.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b156d2f51---kenaferibusetup.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5b07259cc94f11da7e6ca8255a1206b/rutonazekemupuw.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b76a3ac4---67911383276.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/55d701bb58c58128e1ee79f769e9f4e6/judirirabumugasukafonixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+general+1927PDF 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_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 10264 bytes
SHA-256: 0bcd18353b8634c98aa3f3df246429d35d09ec37411459270d57af2a32e37939
font_01_sfnt_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 23628 bytes
SHA-256: 8c7cdbcaeb74b29b082c7ce2f925e680d43f20c446b144c7ffc3ad5cf00db7e4
font_02_sfnt_off00013abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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