Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce57594769cb2eb…

MALICIOUS

PDF

91.1 KB Created: 2021-07-25 22:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 331aa0225631452da818f3109672681b SHA-1: 0a5a9165a864a97903727ba6249b743c53813325 SHA-256: cce57594769cb2eb446952d02475ed1771e2561ffa0b77fb9dd52955113fdea7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093bd2b74528---47611820064.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608e781c68ac7---gajevumipatijelaputagu.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/13955965238.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4364d9dfa---nanuvameponokoxovewus.pdfIn PDF document text
    • http://dzbnf.com/upload/file///mokewuwejepefajavifufaj.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/6431570709.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/u1aefokbf58ndd6chhho2lp4kt/siwuzuvizunegaso.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/1470345781.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/14923570431.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/77909500559.pdfIn PDF document text
    • https://tpk-m.ru/files/file/duxalalesotu.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/9296a327c85636e3ec45ea4480b66993/tebilisezotika.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d9b7d053c---15055223208.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5cf7e55da---10685715413.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/fabusesize.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/3929358654.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/39366759216.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea73f046f8---nubijokorelurezilipumewel.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa688df57---jexamekotanezopitukolusa.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/256c1ff2a040d9ea5eee58e6928b1a1f/94389568587.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9095526b7---45095230214.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/jolokuku.pdfIn PDF document text
    • http://cartopack.com/Images/file/44751189777.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/84811561809.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/4bf0e02796b6dbd36eaab686cd9ace49/burolozo.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fd810c6c1ad---xunivovevipipitis.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/ea8296b165004a2f33a13125fc647d18/91037743585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ya%C5%9Far+nuri+%C3%B6zt%C3%BCrk+imam%C4%B1+azam+kitab%C4%B1+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_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 19388 bytes
SHA-256: 62005eb6549ee458b898e4eff293ae0f0d56330b2fe071f5b646c83820ad3113
font_01_sfnt_off00012a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14286 11264 bytes
SHA-256: f4b57533c1b58fdc31c132e6b261d161ae5172f43b65bc1da8107c1d3916bb83