Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff22b2b7bb074246…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 22:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a058b607ace60963960b1938828a9ab6 SHA-1: b984da21504728a15f8d7bb7a904a23b3db0a923 SHA-256: ff22b2b7bb07424615407509db326a0595ba4d27d90aae83aad273260348cd8c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The presence of a link farm on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079390be6d74---xaranosovapibuwakemes.pdf In PDF document text
    • http://aviatechinform.ru/sadm_files/vumogejunisuwosajukesawo.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/59300753158.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72a85e2809---3172114767.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/12728459981.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9f94d68e0c2e7eda24ddfd08c13dd232/suxufatidapopegokumefizax.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c594cc289a---75080043244.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841e5774cc3---semeloboromowipagoturero.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/kilalasaguzawaxowovegaru.pdfIn PDF document text
    • https://2acontractor.it/images/file/podujanekisabeleguzu.pdfIn PDF document text
    • http://devveb.net/userfiles/file/jesaxavijazulifopusirun.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087d5e58c5a7---busafukumu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22ff17658f---85528242111.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/66534571610.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/jalawuguromolave.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/judutobojuxadiverowowun.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/26516848890.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/47203582937.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/vulodojudataxav.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0e91ad980146f0f536dfd2dd898268c2/27785899854.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210520054110_z0goc0.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/rekalafiwogud.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/71290669361.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16115ddb5a0f72---33808654058.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83f4d2e43---93316909916.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/27272768500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=french+revolution+movie+in+englishPDF 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_off0000cf93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF93 10656 bytes
SHA-256: 6c8deeb85b4fff40586515777ec7414338fd337428d329a6342f836c84197f67
font_01_sfnt_off0000e7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C2 18188 bytes
SHA-256: 5920c24d81656d22398d2d88741af2ef3dd0cd1e3c67cdafddfd527eb05be0bc
font_02_sfnt_off00011790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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