Malicious PDF — malware analysis report

Static analysis result for SHA-256 104db9258a3acaa8…

MALICIOUS

PDF

448.8 KB Created: 2021-07-01 13:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 749b101f73f70791f246bad3cae4a037 SHA-1: d36e43625ef48b908a0285e080ffb7d77b066817 SHA-256: 104db9258a3acaa87cd3f5ad3e62532f1f37f4d60106bf833f0b3800e7dfe523
166 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically identifies an image lure linking to an SEO redirector, suggesting a phishing tactic to trick users into downloading the malicious PDF. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7540

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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 https://irlanc.ru/uplcv?utm_term=the+autobiography+of+a+stock+free+ebook PDF link annotation
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe86d341d---zevorupuf.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3rtlrh4lp4apk7o2mhvdou33qk/vivoxomewuvikagu.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/65655769740.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/44fe2a2ce7711815aa873488d735d275/zujifaw.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/c0pbj5b35dt3qlb186u63ltvip/45258868331.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/5b4b9e76e0434b54b4d623b243b98856/85095991548.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/moxukonozu.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/df6b14ec8aac5184cb73c8f8717e2e33/67972145115.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/7d406148d3da680b7d1ef3a468a99e10/visojobelenolejimebexesob.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/cr824fuo3qvk351h6g419u1bpt/53427354939.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f243b6b0d66378de905c4f565960d96c/63390643522.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700005d13cb---13074108555.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c93524b99db4837ef8e53dc91fe49a39/sinabuwasosu.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b94dcea39ac---51911524642.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/5020e6d69eed29783a8678a05bec03e2/38219046836.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607499a787fb6---17244441806.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021061722747_390208606.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/25900920678.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44d8d89c4a---93651073595.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/rkl16g6noko06ptccscmj58ak9/73694674838.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/287e5de153f15f81685d5989d04d7e5d/gusanubiruravofikaki.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f7473e892---72506762749.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/mev5261ii0fj2vrim5vakqcm58/tinodavumo.pdfIn PDF document text
    • 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_off00068ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68EA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0006a6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6B5 19712 bytes
SHA-256: e47a5ebdfcd722163d6c1cac316dd67cbd761b15e41ff1fe1563d9ecfa2b6619
font_02_sfnt_off0006da63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA63 11016 bytes
SHA-256: ffb6c917f371fe7dc2fa1eac03bc1fb11fdb605d14e2c5b696e034fec95934af