Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b35cd426390274…

MALICIOUS

PDF

81.5 KB Created: 2021-07-08 21:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 86be7e25102b3d38831524583abb852c SHA-1: 0f2bcbde1c3eb941f1653a460f03e797e11dc31a SHA-256: 31b35cd4263902740af43ebc26f033d5076dc925b7b06ce85daea78689998b19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malware or lead to phishing pages. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://abwplazaview.com/uploads/files/ruxotiziwagenadar.pdf In PDF document text
    • https://aawyx.com/sites/default/imageuser/file/vaderopikel.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/9d7ef18ddfe539acfa9216adeb529950/linodisik.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/xidikotorufulowetawabi.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608091ec6fb1d---wejaxiregekefubufeweku.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/66445031739.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/27115999908.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1ce4f088a92d88467499451a4da34852/xapavotegovegaxudalutopa.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d0fac8f9aca9d8a0869d098f052085ca/64558951455.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ab8ed7f79e1c9ad291dc3d043591dc77/25752085104.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tejesivirir.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/58412346926.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/e46601344fca1280e87e5a9736f2aac2/52470412065.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6f7h0t5eieipfqp3pdb1uvvkdp/nevutonofozazogewape.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/0v2ea9ehm5k0e54fnddvga10t3/52625766861.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/difakipegakelapi.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/b5a106a2076686a4eda623379d66b18c/12527799205.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/30b55ccb176170ac53abd9794acabb61/49130867526.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/wekolujurururi.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607233a0913a3---fixiso.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210627075852.pdfIn PDF document text
    • http://hilltoplancers1975.com/clients/13753/File/59073715794.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/54813804591.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/20023392022.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ccc13cc6---vapavapirofizejune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+find+range+of+root+functionPDF 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_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 10616 bytes
SHA-256: ceec69709bc20e4e4c711b095fbd7b288c1c961f72b3c5898a6f79fad820e5b6
font_01_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 17604 bytes
SHA-256: 7830258cbd4e8285323b67f0429e801167177565a8ab75aa9b950584f5a05593