Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce9c37b6eb6a01f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 22:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 53fb3fcfa96eb7fb5f4aaff7565ddf25 SHA-1: 8ee6ab5508fa0d8e51505b3bf7cbd423b93f284f SHA-256: fce9c37b6eb6a01fa88b01b86bc9b15edcf2632aec1952359b9cd330e84c5e1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating an attempt to redirect users to malicious sites. The presence of link farms and the use of compromised domains suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/k5ikvh1ugbvr7quibtpd7pk3h4/21420818134.pdf In PDF document text
    • https://evermoral.hk/upload/file/1630516138.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/jomobapejeme.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/97964948ab89115ee8899afa2d7d8a34/85088672119.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613245d1a2cf2---dozojolenakig.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/83108859974.pdfIn PDF document text
    • https://scalping.ir/data/files/file/72820624986.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/56323115120.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/baguk.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/sibezefepu.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/78013769212.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/pemewulerifige.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/no3ckp80j8laqn1p1ebh0s0ok1/dibagikopalobe.pdfIn PDF document text
    • http://screen.by/images/file/39575136996.pdfIn PDF document text
    • https://dm288.com/slicice/file/78863859107.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369dce1c518---90791882378.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/jufafakizapabado.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/39234233087.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/29902340722.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/5bda31e5f077da17081da0ec6c8f638f/duvawedekijob.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/91002296234.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/bemenokowivu.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/71369359362.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/dufonoxokox.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/tefufapu.pdfIn PDF document text
    • http://ty-int.com/files/files/77951005720.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/28227766085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=apk+annelids+hackPDF 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_off0000e017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 10368 bytes
SHA-256: 975fd2144e9e4bfd48b5ab5fafc380fcc9b675b9b5b26c70e9702aafdf54020e
font_02_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 18024 bytes
SHA-256: 166254c4a3f104bb67e754f9d7e284c5be5d68ea271d0c1f610a19c443772a8a

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