Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f92b7ae1e913f4…

MALICIOUS

PDF

94.2 KB Created: 2021-06-28 14:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e4616c7344cacc5b83ff951c14967918 SHA-1: c7dbe143b29a25b9013218370fe3380aace0cf0c SHA-256: 20f92b7ae1e913f4c53ad0e28d094572f0de84ffb3cb3d2ed800586098f1128a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. ClamAV detection and ML classification strongly suggest malicious intent. The document body is unreadable, but the presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs suggest a phishing or malware distribution campaign.

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.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607501e64b295---lalifiw.pdf In PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3ce5a749ce2a7bf70380bab4c54338c6/39384055388.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/j80d426qhjd3diap3u3v1mip70/80929461809.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/90926701360.pdfIn PDF document text
    • http://jar-ted.pl/file/51899035434.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/97ae9dbb99fa3bc3608e690106f0cc8c/belunakixi.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b8bc219e0f9977d056b74e8cb3de8371/88923285935.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e02599620---tivigizefewe.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd14e36b39---dukilukume.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a52b8a3ec---segupirimujowun.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16093f5cc5fd9b---dazisujesuvidagixuruwi.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b37adef4ab---46854114138.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090f21e9397b---woponigezamo.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/najotakiwesitanizew.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/74b04g4c49j3c69g5gkmk48shf/79763650255.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb436ab7d6---97663727346.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b7a493c1d7e---rofas.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b415da2800bf460c472d9f576ce09fb2/84989477824.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/92416908883.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/fekevuxigep.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/7288434766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=we+miss+you+rip+quotesPDF 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_off00011077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 10456 bytes
SHA-256: b9050149bd9efd88e04fb2f2ee5c652415dda8d57565425ab950334c4329fb3c
font_01_sfnt_off00012841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12841 17028 bytes
SHA-256: a93f0e78df96e7e3e6e2e5ac2b583fc250f84b52f4abb3c089cf4cf79cafdcd2
font_02_sfnt_off000153e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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