Malicious PDF — malware analysis report

Static analysis result for SHA-256 48338c362d8afaf9…

MALICIOUS

PDF

79.9 KB Created: 2021-08-24 09:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd5f18d6a4ff1eb318dc0399391a8005 SHA-1: 147d409d7d3478b4a947bbe2906482e116e1c53e SHA-256: 48338c362d8afaf914abba7847cf5b3376367a33368d402f501ee39d0c4cdd5d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links are designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/epkbveaugo51gunloc7dhsurn1/gijuwavegejabafebiwubi.pdf In PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/99326689452.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b0a5f503a5531d7c5efc74206f1dd0cc/mofepimavinobujuroke.pdfIn PDF document text
    • http://atomleasing.ru/media/File/56666860138.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/67447880898.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/bikosugozerodekuba.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/99941595201.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f8a0818ef61d8587e3c5544f84c2ff67/solilidudanubilogaxa.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/6a406c840acd7edd5986c36f34bf5e93/robejomewutagezutene.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/2a81af4eaf776dd28ea80181ac6828bf/banijaxagekukuradof.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/888ifr74v9r8fjsnkpdur2egbm/69940286131.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d2eb60e8---22936340501.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/wojuvusexogirufuwuvuxid.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/lafokimafip.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabc6621a0---pulazanon.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/7372e8c34ac93e319630cc3292381907/77438874741.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/rb4mnd3hft8dse7bsekkhu25mf/lefadawo.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f7613e07bb8---jurijawi.pdfIn PDF document text
    • https://buyafranchise.org/files/files/76106466619.pdfIn PDF document text
    • http://hodori247.com/uploads/files/49891332722.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609566afc63d5---bodaliguxorizo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607005a08ae8a---wilukusevexani.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210814_74112E929237FF49.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cls+legal+indemnitiesPDF 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_off0000d526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD526 17340 bytes
SHA-256: 0c5f6f205c8bfa39643760530f409a360bbf0fd2203126ddeafd37d80018ff5f
font_01_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A79 10400 bytes
SHA-256: a752984074a86d45ef9a3f7e486c3c9a764a1b1fcdb6dc5745c4247d600f5aa2

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