Malicious PDF — malware analysis report

Static analysis result for SHA-256 1668454f5512043b…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 01:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f7dc633e5894dc42aacfa7f4fed0fc96 SHA-1: f493b78e939b0f2707bbbe87d0bd6d42dd47e2b8 SHA-256: 1668454f5512043b401bf53177501085c197b07c2a9362e5f3cb0a9b6cdd053f
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://mientaytourist.com/uploads/files/wekekiparugij.pdf In PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/26418052466.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/72711fdb03da27266bae89107c45f714/32496318269.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/33792246794.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/58191145630.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949345585a0---fijabogilugojuse.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/maruj.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/9a4oj87ujjb6asao5nv46pfs52/22347344427.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/caf714fa6dd2fcdc5b6d654d667fb00c/lidavevusoputapamu.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/df025244f2424676767224dbdf7a9316/21347942144.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071eaedd95dc---9470484737.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/415b71ef41a00896be6178ad7b35cf20/pesutuxowebevalase.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/babevemimulutibaful.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/8h3p47276fnrip3mq1bdvn6v67/90720195763.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/mitaju.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/emlfkg1ebelescr2ouq0vpaov7/zelonavo.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/e3eb16ad03dae29014bd2732198df1d0/76342931168.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/zonegenobozibuluta.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/62541947124.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/7kp7e9acc3suvgrh8s9s2kjch4/gogetok.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3ad4a18a6---wurozimarixamidu.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59fdc0759410c61a2afe9e03eeee099d/28646459808.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/914e3c394dc792fe54b48e21f40422ce/vujopijuzimifo.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60d54d54ae---jonubowuwimigabukifegogo.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/c5b37a16879fe0270222c7822b621ab2/vogopufonowowajesaleregoj.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a708bf9636a---22221478424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=care+after+tonsillectomyPDF 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_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 16636 bytes
SHA-256: b62e21c9f52a19559539956ec3937a3a69fd60c96d830ffdb63954aa100c4c4d
font_01_sfnt_off00012025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12025 10644 bytes
SHA-256: d48196ed77f3342d84557e705f5f9735151b41c116de5f90543bc058309882cb
font_02_sfnt_off00013890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1