Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fcd101e95d1bb8…

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 20:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ed9a3eda8fc537bfcbc35bc874f63a0 SHA-1: 28f2c86ab527afdac8faa6133a736c0ab06c60d1 SHA-256: f3fcd101e95d1bb8e45d1daf538669222f01cad020deabb58fdac0948f98ca3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kutscher-customs.de/gfx/userfiles/files/25751512409.pdf In PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/ralivil.pdfIn PDF document text
    • https://lapakunited.com/contents//files/43279776350.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/samezezujuweripazavorakis.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1611221aa2ebb8---bevono.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/31807102287.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/getipopegevimib.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/35982842124.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/b8a3103ef4a48bf1aa79f26d91c5c654/76860874299.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/66755598783.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/bf416124d829e422678e82374af987c9/10701235465.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755fe0b2a2c---kulamaduxuni.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c4bef2bf2---84585252844.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/72361137119.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5970cdc690---42272037167.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/6e01c0eab1281668d78efa1428d4f97b/botogegifokavuwamupijedom.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/rixukatezujig.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/fibexu.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/dipogapinudimifukidudon.pdfIn PDF document text
    • http://rococosofa.com/files/files/52855598320.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/02f75de07294281d1843a6686f306742/59623732907.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a966e95057d---43677988248.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16071652a05360---37454840735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dictionnaire+anglais+allemand+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_off0000e4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 18600 bytes
SHA-256: f0530d088126c9b93ea36ba7c05dae87b8e5e2a20b78f16f35c6a5a71d80f9ec
font_01_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 10964 bytes
SHA-256: c73a33e6a93090350a7edf52a534b0c83a8c5c5814400f0e329bea9ba09c3d59
font_02_sfnt_off00012c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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