Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f1ec89609001c2…

MALICIOUS

PDF

89.7 KB Created: 2021-07-01 11:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: bffbfeb0fc304f3339f982027e75dd0b SHA-1: d03be75258bb0a30a030e53ebecae6f0f590a43c SHA-256: 16f1ec89609001c21cacb48932197e0f8f2d5a80e2437811935afa07383fa396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b8816545103---52367987385.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6dfe07c06---55738751171.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/3690929291.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6219ef8bdfa94e53fd17caeff35104ee/gabepux.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089094401205---59190978399.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc234bbc0---39271013240.pdfIn PDF document text
    • https://pellevah.com/upload/files/25072301108.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/jugalorimakitojotanedu.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/09ad1a4a77bfbfa69a4eb33bf266b930/92906913577.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/almsi7qrdtrgnkhh9t2s0e1kb0/jikezavutomewaw.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/uloj29vharrpbg2qpegj8mgn2i/ziwafizavetaza.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/n2qglsp23j2hj70mpb4qnm62i7/govepuludafizo.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/8484827dd0f9444492aa563a04bf55b6/zezefidunofusosanaf.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/bafosibumugojufikexo.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e0b7b75aaf2790a629ce5162c44e1760/vanomakewubupupegoluret.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/39155285627.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5sra9416anla5mts5kv7pst9c1/93722564578.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bde29b2c1---sarivibanumonizojov.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078de305a844---futupeli.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/6783673978.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b31c95bad---88060044245.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/60894935973.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/kitemebasebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=soony+and+cherPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_01_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 10252 bytes
SHA-256: 387334d9f69d7a00739f5dd2286e69efb1869d6abdce63f529cbc8ce6da5e259
font_03_sfnt_off0001286e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286E 18280 bytes
SHA-256: b2c9f09e823846a18df816479fd8439e03f953b0c529ef3e957219f35a0c4422

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