Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84da069900861df…

MALICIOUS

PDF

84.7 KB Created: 2021-06-28 03:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a3ec33593f5669aeb243d300e63dec7 SHA-1: 8c56d7dd9d5eeebe6d0e658c56d73cbdb74d9a6d SHA-256: c84da069900861df77b05096ebf8b6c3d9c501c505034be9f79270c669193b1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, primarily through its extensive link farm pointing to compromised WordPress sites. The presence of multiple URLs, many hosted on what appear to be disposable or compromised domains, suggests an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=group+8+elements
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6585bc5643f601ab9e0db64e36dc12cc/93507378236.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/p683libeqticmn3kftietrr024/vodapopitafebid.pdf
    • http://studioriggio.it/userfiles/files/xukadawematalitakobazaba.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ge6ieqtjrp9hf79i6rdi461l7a/43740313301.pdf
    • http://skupka54.ru/upload/m/bebevegetuxale.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/939f660378a1a31aae5a042024469b45/79822389454.pdf
    • http://szzxwx.com/Upload/Upload/file/2021624050215444.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/40179951129.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3449b32627---38307183320.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/827c37710602945c228822f065534612/1262945105.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b04628ff01cdcfcbed61f150069aea5c/97156358601.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/p2sok967nln38savp0telf12bl/35925265925.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088aa6e25730---zovinekenog.pdf
    • http://libertyquad72.fr/userfiles/file/penokopaluxasubok.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e17ade0aaf---timajozizima.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/464569b9cebccd0e503f4920fc4f8cfb/58538959139.pdf
    • http://ajivikafinance.com/userfiles/file/15588209555.pdf
    • http://architettodrabeni.it/userfiles/files/bafexupe.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ccb734aeb---309369831.pdf
    • https://noddy.nu/images/file/muzawivodawimasekareboxi.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/cb5f7ceb59e68fb71df1bc34233344c9/63535862293.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af87ba4d474---sekus.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0afeecc4f---40388276891.pdf
    • https://arichaindia.com/userfiles/file/37747126582.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a00527494a---fijabiroviluperugese.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_off0000e963.bin
aa804c8ccee4115e3369727d81218b68baebb8a2ed2068b86832cdeee2877640
pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 10508 bytes
font_01_sfnt_off0001015d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 16792 bytes
font_02_sfnt_off0001196f.bin
a32e43905388ee7d57f9974a64166d42c182f0831cefcd430f3161400b8dec78
pdf-font-stream PDF embedded font (sfnt) at offset 0x1196F 17092 bytes