Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c13bd93a7a6798…

MALICIOUS

PDF

85.1 KB Created: 2021-08-19 11:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: faa71579f98bf1b8d3099489b7172b49 SHA-1: 01f7a21fb56945d6f0956b62a8eab8763f1b959a SHA-256: 01c13bd93a7a67983367add9a468d473c3ac26c49a3d69a765cd9d5bb0dfa925
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or download further payloads. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb5b830331---49161812620.pdf
    • http://aaaexpressac.com/userfiles/file/dasogujonevopojovize.pdf
    • https://foursservices.com/nbloom/fckuploads/file/43358976304.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/5810ded9dd6bcc91907e75bc61914cd2/16944534439.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f1555c46503f8de75d2d47b0a2b9aee6/80464835466.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ng7sj2cgcqqcmhtvhb5q48fu29/25223943138.pdf
    • http://vrieshorst.nl/images/uploads/file/vupugodugupobanubi.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c8b6dffe37ccabfb7ba8eff0cde385c1/dijavibuvesulezalagonoz.pdf
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/38394679648.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b340abcb9b---18196186222.pdf
    • http://colegiosantarosa.com/uploads/imagem/file/53109078312.pdf
    • http://luxmeterthai.com/ckfinder/userfiles/files/15519118559.pdf
    • https://monamifrance.com/FileData/ckfinder/files/20210802_D0C196A1403AA96A.pdf
    • http://armanetti.com/images/babadadefenojif.pdf
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/benofojubuxusosunu.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160715d8c8a695---mososisasixisikuzip.pdf
    • http://agisma.ru/files/pages/files/90611174882.pdf
    • http://daonshop.com/files/fckeditor/file/36703945373.pdf
    • http://pphu-joanna.pl/fckpliki/file/sepibowojefa.pdf
    • http://visit-pune.com/userfiles/file/32884146566.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=snow+white+prince+charming+name
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cec3.bin
b1a0c662ffe3d4d4272d0cb41bdfc39f8d56923962d7d96270efec050d3bc569
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC3 16996 bytes
font_01_sfnt_off0000e6fc.bin
cf060056140962d5c3d0f60fe57b6965e9d4c6038822249b90091669d0a657d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 17228 bytes
font_02_sfnt_off000113da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 16792 bytes
font_03_sfnt_off00012bf1.bin
d5d0f06bfd5586a9d9be370da20e223b038ec8276b93dd701114a1afe68a92a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF1 10768 bytes