Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc9da61a10b3513…

MALICIOUS

PDF

86.3 KB Created: 2021-07-14 04:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0ae5ad6c2cf945367b90dadc010aba1a SHA-1: 1fd8893f14d5a2532c485a745fb4e967ff52ca5b SHA-256: cbc9da61a10b3513d175ec8d025f48a153eabdde44eb6e1f0bf140b8bcf169bf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098385df2785---87316064387.pdf In PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/30898897652.pdfIn PDF document text
    • http://innotack.com/userfiles/files/13709801950.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16084dcee611d8---92628311158.pdfIn PDF document text
    • http://asustainable.com/global/file/fijak.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/97c2480dbdd2af7b5aba4eff375b1fe6/jabadogixomanamu.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/70752959105.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qr4alpi82amghkmmtc37nkaue2/34762202907.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3de3f645d729e8b6dfb6d078aa5348bb/71625092825.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/momojewufanimazimamoke.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/zowir.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/doboxikofelutojef.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/34602982892.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe3a8e74b5---51757977895.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a84199e621a---67191563147.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/39524147747.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d28c1703aa3---2540252483.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/nekarofirobi.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/96b3b42b880d1e50a36bca6a20e2b553/33153476468.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/subisozojadipiwin.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210710/210710083222354981sx0mpax11xdo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=stars+and+planets+book+pdfPDF 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_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001064b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 10708 bytes
SHA-256: f18b02814d37753bb926018c81eda9a3847741c7bb227922f232d032d5c9d869
font_02_sfnt_off00011eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB4 17428 bytes
SHA-256: 38f7aac3e0cbc285f294eab334fb9fac708721536f1fc2292b8c6f6fab96f388

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