Malicious PDF — malware analysis report

Static analysis result for SHA-256 a662975652037724…

MALICIOUS

PDF

83.8 KB Created: 2021-07-03 03:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c612396e3d21554321f329a41e25d6d9 SHA-1: 78e62d2c6d8c1682a240db0d0182d578a24956b0 SHA-256: a66297565203772414fd4e9598a7813156443017306c1e01aac83d59158b587a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, likely intended to manipulate search engine rankings or redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, with the primary attack pattern being a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bab0fe0601---25608760391.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d72473573---ruburozafuvajunexagedimij.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5f4588b999e6eaef5f69be981b27c958/48052590286.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/zuvukibumuromuned.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/8d66b6e4a33a74ffa16bd2d9aec804c0/zotirawuteduxem.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/hn24haca80ittnfb5v2jq141k2/vizowexezasifixurekuf.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/83218002106.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6cravam1g2nd3mliusc71a720g/65792959749.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/fojunefawikafusipagor.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/bcgqmtna6ksbbbcukl2engi6p9/nakeduzilodumelirinor.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/37525809392.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3c6cbfc4d4ae5141ded8d5c4bb5e79f1/63124366992.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4526946c3---82840931446.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/h3ojqu50reali8ml90fflq7fkn/saxulavonebusolaxuzibazi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4171ee597e---22870575828.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988be47234f---49711378466.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/79242391048.pdfIn PDF document text
    • https://loctra.net/userfiles/file/2374154144.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/88389588195.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/nujefepasidugonuse.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/07h8ihc32encfs3i6up457nbf0/56526249997.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zulezovogena.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/66pui8i5jk657i38lguv1hvm6n/nasanozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=whetstone+publishing+books+science+class+6PDF 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

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_off0000e415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 11044 bytes
SHA-256: 236922eab2d53fc958c751e9674aa0e691675781af140e73c979e5782808ac03
font_01_sfnt_off0000fd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 16432 bytes
SHA-256: 6ff8cc28a86810633bb93723432fbabca53ac445bf7cb65621ddf5e0487edcdd
font_02_sfnt_off000127cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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