Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c0fe3e50c0adbe…

MALICIOUS

PDF

85.7 KB Created: 2021-07-05 00:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a25e750fff9d6bd736c134bc6f98a65b SHA-1: 25a6ddb9fba2dcdfc04136c03eb1a3cf2baffbe9 SHA-256: 04c0fe3e50c0adbe85f59386de61e4a3534186d7940711b88be29250e5a81e75
156 Risk Score

Malware Insights

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

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt at SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/68afab9322d071de3e55f03c22f71374/44025394858.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/0b8e52591aaf17f13def6ddc5329bdc7/43779943503.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/m4rtn0nsv2oa619i4u4b9u6u9h/jifaf.pdf
    • http://3xlove.com/uploadfile/file/58999031574.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1501790dda659b9edaf987f4de15ba50/bonazumesibunajudux.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075dea4db1c1---dujajotixawidisesirid.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0b38936a61cfb9807b196838829bd4e5/kesiligezazilej.pdf
    • http://muacuoi.vn/Pictures/files/wudixozezaxesuwad.pdf
    • https://poolpoint.be/uploads/file/tagikoledigureve.pdf
    • http://tubietelbar.hu/uploadfile/fasuxutufevek.pdf
    • http://radissonhoteltraining.com/userfiles/file/xunolerogif.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/972e886fcbe71f79a23b7787041c2d40/27404836567.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b68d562428---60867976192.pdf
    • http://ultraljud.nu/bild/files/tosetiduxaxapovojugowi.pdf
    • http://absolutelyneon.com/userfiles/file/pokopokituvap.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b62076d9101---rusodisunorijus.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/2228126686.pdf
    • http://ssujaxchapter.com/clients/83257/File/62851699797.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fbf9beae7---69167159603.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e90e218480---busipidijagovo.pdf
    • http://alexlunacoach.com/img/editor/file/33687775170.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/db20f6414cdb5d444ca88bd283f732b0/tasafepi.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/24a057ab22a2386f91bbe966e40c1184/xivonafufarazizosiwamad.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=3rd+force+3rd+force
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 16792 bytes
font_01_sfnt_off00010101.bin
cd9b116bf23aec5de524ad38c616e4f92197b7041e1ed86d5e124967b4d60450
pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 20664 bytes
font_02_sfnt_off000133ff.bin
288a374fc37f5d6a25bb072c44c20829d9cf7805ef9d479128da996460af5b54
pdf-font-stream PDF embedded font (sfnt) at offset 0x133FF 9872 bytes