Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e508195a1bd435b…

MALICIOUS

PDF

105.4 KB Created: 2021-09-03 23:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f559f29ebed5ab215684c04e267881e SHA-1: c286ee7ca50664fcaecda2a0641fb687993aeae5 SHA-256: 2e508195a1bd435ba554ca76b784f39bca0b7a882847b6ffd2c51779eb88495e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://festival-bg.com/media/ckuploads/files/10849428944.pdf In PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00e4624cad---7803203455.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/76438787543.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/78234823260.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8dd1d057c---lenamiwejup.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607af2b90e441---69577370413.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/lojajob.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/29095220336.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/33198797266.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8e1a973a17c226d086c4a1b968161c41/suxuvojavakev.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/23028847787.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/28136360911.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b739722cec---kiropu.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/13955819435.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eff2bf2f0b---52881683303.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f34313e2a---33097335650.pdfIn PDF document text
    • http://ducnhua.com/upload/files/kaxamalojuw.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/50728825291.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/juxasosufikesudezo.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105130420057149.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4e184c7797d3a119faef67501ea34640/kimadof.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607afc5d87741---91140689244.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/96804477058.pdfIn PDF document text
    • http://afro-safari.com/upload/files/narowenatemafi.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/5102624828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=orientalism+reconsidered+pdfPDF 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_off000133f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F8 10804 bytes
SHA-256: 4ece2d5db935a72697ed55c8e79c9672ce8863323af573b7748f93a5c36b37aa
font_01_sfnt_off00014ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F2 19236 bytes
SHA-256: 0efefbd18b521298232cd851852741b4f091877c003d41fa050f8c32c783c1e5

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