Malicious PDF — malware analysis report

Static analysis result for SHA-256 03509fe3ea729cc1…

MALICIOUS

PDF

78.5 KB Created: 2021-06-17 19:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 639a328bf8dfe69c1a19b284537f34eb SHA-1: e597061db1da4691df6d565e5b7af1a5526d3097 SHA-256: 03509fe3ea729cc14e5e6dc316349b68dcdf38906e03b1ee68a7b11bb313075c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=online+life+drawing+live
    • http://businessvaluationapp.com//fck_files/file/wivibenaja.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5314cb510---44984245943.pdf
    • http://www.alfapilates.pl/upload/file/ximebejoverazelizoxibikit.pdf
    • http://alexhoffordphotography.com/temp/files/file/41862010840.pdf
    • http://hoanggiaphatland.com/uploads/image/files/46455456170.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8b89a3325---78261225310.pdf
    • http://toshiteriyakiburien.com/uploads/files/89147920183.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4debd0c4db---6315019886.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c105fbf05d9---wamosu.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec6bc769e4---35133282560.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/51366438689.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/c9e1643f84ae1f2e9124d7a82eae337c/1446489610.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/e1800906a8b8452a64b1a33e730c8c30/lekupofuvuvugevofidi.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c11801a6748---bapugefunipararuxudekupu.pdf
    • https://pakistanchristiancongress.org/userfiles/file/81032776055.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3cb.bin
f8a3aad7e5d2ce6007d20582fad0024265bec60d91c6031f79f7e135af2d94be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 5076 bytes
font_01_sfnt_off0001053a.bin
60529fa5bf4f8e886345413d703c3202a15e86c6ffcb114d4e92bf9e5af8d152		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 11508 bytes

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