Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadf4c10dc0c4254…

MALICIOUS

PDF

85.9 KB Created: 2021-07-03 17:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d08cfdb7704644cf80ee9bff18bf2ae5 SHA-1: 192571b3bf8599395c5044f36bd48e28a2a9132a SHA-256: cadf4c10dc0c425485dc7932b42e4f2ca7cced161d6f7f1d83ddfc640174d49f
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and other disposable hosting, suggesting it is part of a link farm designed to distribute malware. The presence of a 'download' button lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=the+sims+4+get+famous+torrent
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608df7eca91cf---68773615707.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/5aa89210066c6b87769e8db01786748b/boxirinifikexajonega.pdf
    • http://meyanko.com/userfiles/file///45440097510.pdf
    • http://timeyear-v.com/userfiles/file/wezifobakamugokixasa.pdf
    • http://fly.no1-yes.com/userfiles/file/meluwixadituwinejizomaku.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098588feba0c---nakibime.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab8cb38b8---vebememiwaragopo.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/5f47a7c977bcd34e039514d32f2d7993/67211666884.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b23eaeec---21433704884.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/61046303168.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0515b407f2---16567160067.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9bdd630f0---bamopejodume.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097451342f6f---37539663970.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2997f945---lonupizog.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b79cc4e0b57b3e03e74a7a64bfa69176/jubomuseta.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076930c43f36---rumif.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/efa4cd1db2775dfc6cda40584c377d16/56225163466.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/tages.pdf
    • http://artospace.com/pics/file/luzatizu.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/91e4f3c5284f684e0aa453074b871bf9/xidisibav.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/154d5cbd9376af8706f78c61842f720c/47576519870.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/h8hsvpmk866dpq9d43cfbspj48/zomotatexurexabuwog.pdf
    • https://m-isc.com/userfiles/file/61016636409.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6e019b91d---konoderesewotunozatozom.pdf
    • 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_off0000ec2f.bin
03166a5c07dfb31bd46d62ca501d375a348b934072a0f151ad2fb133d02eade1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 17292 bytes
font_01_sfnt_off00011949.bin
ba184b4704ebcfb29c629d6eba793a3047f9cacead74a54647762318b7f23eae
pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 10756 bytes
font_02_sfnt_off000131ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131EF 16792 bytes