Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2a573ad40bab84…

MALICIOUS

PDF

97.2 KB Created: 2021-06-29 12:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b5ef1a188456dc80c248b9a307bd74a3 SHA-1: fca181ca843061e185add701cd18130fdad37860 SHA-256: 0f2a573ad40bab8444e6781c1e5a65223a5732b5d1c2c57b21bc9696b27f5b81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://infrive.ru/uplcv?utm_term=princess+margaret+and+antony+armstrong+jones PDF link annotation
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/156e12dd203a6b9840754e0982d6917b/35460016769.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c9c0f04d8---zozoxevadaxu.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609548bbb1ab8---65415638550.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a4fbab073705564a6c97bf99478299f7/53562401946.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca8f7bbe6---48046015483.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/27117058445.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c786a207a4---ziretug.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/7e264c14a642cd307ede2a7adac67fd7/58022983674.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ed6f8d28e---zijanedoli.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/45674996336.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/63280451900.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b25f44e53e---38839192196.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/zefoziletexaxi.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/b1bgvssvoh52vr4matr2scem06/guputodizoka.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/zufopane.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/jeginumamemenosepukeb.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/77e0b1dcb8b5f893aa2d7e54f797e703/8607958446.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/kfcst68m0ul2dn0hf4c3su30a5/dososemofozorepaxi.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/rujitolenijawaj.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/o8r6lkaef5qs2bloh996ckhph8/53396220429.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cfcb2962f---38824718464.pdfIn PDF document text
    • https://baptistfriends.org/media/gemimopasawakamigetigatej.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93fb5692ce---28974208958.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/zumamibowejufajuz.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/03ba5f58dcea25d3bd9579b91673c05c/97415092232.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 17996 bytes
SHA-256: f24c765cd91ee5dc544437ca7324ca541fe9fa90fcd75b808057b9badecde8c2
font_01_sfnt_off00014616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14616 10912 bytes
SHA-256: b5b12de39fe8affd43630e8474c92f5ad690196fec69f0cc2143db621aef0393
font_02_sfnt_off00015f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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