Malicious PDF — malware analysis report

Static analysis result for SHA-256 0642230a83c96199…

MALICIOUS

PDF

71.9 KB Created: 2021-07-02 14:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ef3c42ef9af2782cf86c431e69af5828 SHA-1: 614da97e0af2729575c2afb60492fe8489f7a90c SHA-256: 0642230a83c96199ba00bbfce64b0cb3d656fa4dd1ec4f02363740cbe3b18c5f
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is redirection. Several URLs point to compromised CMS upload directories, suggesting a potential for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a848c12a35c---zotezituxawonatanifon.pdf In PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/cr5h473bvv0et40ejc9jgou441/xipezazafipivikawil.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/navepufiteda.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/lerikodi.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/narekara.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/kipedawoluxemox.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/114p0oftk2p7kh80l9lskek55h/gejosileregukewa.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/k1h1r7bnscv6qh3dk8u740v7qb/12097523065.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609273fa436fb---muwepug.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/bddvl8o85vob1hf49hpobncnmq/51139233311.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/53724640731.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/81858689546.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7f3d4cd7---vipasegenusi.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/q6sdhf295pffpvb96l7gvm6cj4/77089712177.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/26526521492.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/41509503776.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d562317218---88373450943.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b839dd70438---50652697661.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/lovetiwugagalerodugesepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fortran+77+by+xavier+pdf+downloadPDF link annotation
    • https://mediaget.com/userfiles/files/zifulejewipovitubatowonun.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/517ab483f9bfd8f6e3c91b81e600c134/95385437977.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE4 16148 bytes
SHA-256: 68da896f8b0ddd10f7f16d999c8151a4e2aca563df7de4d859ce240c05c990d4
font_02_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 10860 bytes
SHA-256: 22e332cb4c2e1bbe42dd10b2cc1e54a10762b39859989776b0ea402a00343c9b

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