Malicious PDF — malware analysis report

Static analysis result for SHA-256 821731b1a5b65399…

MALICIOUS

PDF

95.2 KB Created: 2021-07-01 12:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c3e7d826accb0692100d8608cf716f18 SHA-1: 3f8a2758eec587e05abc3c5917e2b86141ba6662 SHA-256: 821731b1a5b65399229621dbe4e9839e93732a2d4b05a74f58e8cf1e0b86a838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://krisoc.ru/uplcv?utm_term=step+by+step+user+guide+template PDF link annotation
    • https://247christianity.org/fckeditor/userfiles/file/vuvomisogokuluvizena1621631020.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/21666448046.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ro5ba53sk0kq3f2mqrf76da3aa/jitakilir.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5350100f3a52ffab4aede5b6cd95e28d/rezojewafedipufabepi.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb8d4274d4---tesafiled.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/3885752793.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1524b97397e3bffec8568a471555ca99/zixez.pdfIn PDF document text
    • http://mhspartan79.com/clients/9/97/97d0d0788ec4d6723ba7be3cd58769e3/File/12709614548.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f8e3852ad---50966645206.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/fd8514be18a9037b6cf11b492dcf6d24/97363261457.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/91b4c6cf3bfd74d271206cac35ab3ea6/60529014358.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/83ofi170v2tsl5mab1ofigftv4/66377615470.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c223277d69f---xonupofazewamumovekeje.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607620c903ef7---7446000625.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/90015656621.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b33e75009b9---76085442086.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/firuruf.pdfIn PDF document text
    • http://vswet.ru/f/70701558766.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/nikozex.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/45532848912.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/ropumabaporeloripaxulu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/72441355865.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/d2e76a7cff5a0f3ec8285313608d5ae0/94361980096.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/cc193aad68428cb2f0fbedcc431e15e4/bizikabipulewopaxadum.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_off00011149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11149 10940 bytes
SHA-256: 0059147e6aff49dc8a40a11cb113d4924f597e68448f30a9318dbf5f4c089b04
font_01_sfnt_off00012a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14250 17436 bytes
SHA-256: e06fe27bd2de830eecae4b48a904fa8f08adab27c6f4b9868418fa18c9245d93

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