Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5160271b6fad313…

MALICIOUS

PDF

95.4 KB Created: 2021-06-26 02:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f9df03c353fe4057edc585c7bba923d0 SHA-1: 9aa46f66bba495f6639aa85f0c124e27984cc69b SHA-256: c5160271b6fad3134b3763f55a089254954506412b08da092311c860a95663b9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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
  • 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://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/0a2a3353966a63d1be89c0109f9df3f2/jupefudepujob.pdf In PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/26a3ce8bdb5d10c5a59e3a1ce0c5b55c/wijomalebetox.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/60rjcu76u07jnd14vt8f246rat/16671482037.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b73a37d1239---58470812294.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/fgtc1mi09gal1d3h1okvskikl2/74887025013.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/furemarewumebonirefur.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/p5f42f369h9np3ejgfrjtet601/61463426676.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/30820958859.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/758ed3eed3faef8a6be1d8f3351f4eec/jekejidigexunajunetukomu.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/87225521564.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/vurizofudilenej.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/aki830lm6qcvbe991muhju7kh6/worakizikegokoji.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cdd9a4c8a---pozogasos.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9451d3b74---7900703620.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/3537741894.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/66807d1a6599098cc2d8700d917d0d8b/tirozusilumutopupulanuzat.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf0ad889fe---vewipomikomu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8fado6s0c7vlilridakmk7ak4u/gavawobiw.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/palovodepijav.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f269ac36b---fobadumeninosewofisadumub.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/43088215282.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f84c5851e16cd6b68912f9bf5909bcb8/25267166386.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/eba4ec9a1ece1e1cb4b77c2a416999b8/55540624551.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ebd480f46158ec23aeff9aa4491cbf1c/71559082606.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/pojikexugeviji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=inspirational+quotes+for+first+generation+college+studentsPDF 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_off000111ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EA 17168 bytes
SHA-256: 451b6af2e8477a67c98885a52601ac9722d2f22941904784299b21dec4836f1c
font_01_sfnt_off00013e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001569e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1569E 10992 bytes
SHA-256: 5b2d7d93a2630c57cf0cb06707dbc07d26786d76bbfaaf54e621670db3df972f