Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c88ca4991ce82d…

MALICIOUS

PDF

77.3 KB Created: 2021-06-26 04:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 4475ef10d3b16b37be5e7feda7659aa1 SHA-1: ee628125bb694d7145ab6af84540a10ac76e4c50 SHA-256: 21c88ca4991ce82de3e5888fb0bfcad075ffcd07b49d919b67de2d8730fd3e28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristics point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://synerhu.ru/uplcv?utm_term=type+c+person PDF link annotation
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2rp7vi0klbmi0nta8sq8tgttd1/dujakiluluzonitotas.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15744baee3---buparo.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d638e5e2f1d---munisolimagole.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/f39f94d8e720b719516d2dfba3f86736/wuterekixikawupavipiboxew.pdfIn PDF document text
    • http://ligneus.hu/upload/file/64283565172.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/56991718746.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b826d22f5---77439963324.pdfIn PDF document text
    • https://actor-conseil.com/files/file/vemufeb.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcce7c4772---gezivowosisurav.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/sipirusok.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f8f1f6f9---rikopira.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/wusodukawamawezexofa.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/48955035379.pdfIn PDF document text
    • http://maihome.hu/admin1/file/jabonififezor.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/1e60c286e9bdaad174d74ba8e698f94a/58285910913.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086498518e7a---kaxigelirizefef.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/637c36041a3d2e8a342d0c342747b1fb/19625348223.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a511634c936---numepawenatanobakufifelu.pdfIn PDF document text
    • https://haidangpc.com/contents/files/rinonapaxab.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce488ed8ff---rodidakidakixozapevuz.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/4b96b6af672cf01f5beeb4f332fb66ee/kerukovelanatonevefubeg.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/55486757749.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/xizakotajerupewunap.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607699515712c---4132662773.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_off0000cfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 10044 bytes
SHA-256: 9e325fb9d61a849b1b73d12d31d2fee766f3de77cbb392fb8b72588a93f1c48b
font_02_sfnt_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 16252 bytes
SHA-256: 511265dadf74cdabb92419e4f5186f64c3b0c86ce44294efb79c98812a0f8e16

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