Malicious PDF — malware analysis report

Static analysis result for SHA-256 663e3c164768395d…

MALICIOUS

PDF

87.3 KB Created: 2021-06-29 05:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 44f74cd64d7e7d478ca622ae8e0a1569 SHA-1: f9bc156ebef9680e64218e8fdc76f9f68455a908 SHA-256: 663e3c164768395dab9c08d98e82b4742edce2dd23e3ec48702144b8dcca523e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. Although no specific scripts were extracted, the PDF structure and the nature of the hosted URLs strongly suggest it's designed to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb1058da7---75107030474.pdf In PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/6938936f287ccdb97759807c9721a4e2/difekejizusisiliganida.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/75434ef7f4f434e40466c85024e82e7a/fomag.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/28686564107.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092e5907b44f---17311467079.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/07076aec29434e8ec107f0b547204b66/4773706503.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/vbdn7t1eeajnec25dbvocgvmk3/wuwugedagejuba.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/9955524946.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf1253b6d---91187937935.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/vobodixukaterubigejifi.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/tovisaj.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/320rb3d97c44egip1jt7j80145/41482027431.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/35124212640.pdfIn PDF document text
    • http://greenbrier101.com/userimages/rugilegibobuto.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/39572040289.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/540eitfujev0cge54l3hokcicb/tosexikobewenorozorok.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/fkuitkd02d2cht37mskn6a6m04/64732709498.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/towidapelak.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe6c068f85---wegesutipekaduwuxi.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/gumanan.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/dipakujudatomujol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=stress+and+fatPDF 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_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 17988 bytes
SHA-256: 163cbc5c57c0107e27afe76f869752267cfc17f2d417934fff085ed0ffe99323
font_01_sfnt_off00012185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001399c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399C 10164 bytes
SHA-256: 2daa8d478b430088780a6991beddd651e44390edd375013a566143d59efee464

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