Malicious PDF — malware analysis report

Static analysis result for SHA-256 2811a8781e941d58…

MALICIOUS

PDF

102.1 KB Created: 2021-07-15 19:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 93b540e58ecf8e53b3f703c9bf8a54c4 SHA-1: 7e46f54e83cc02ef6da8e2fbd5aec9afc0df00aa SHA-256: 2811a8781e941d5852a3dada121d0b49a560d6a1c424008ea8b34dc612ccc0c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of links, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. The presence of numerous external URIs and link farms suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/2500fe2550f0daf1d590b145a16886c9/bekoxejusilixitigoloxoj.pdf In PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc2d1e140---2499557360.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/jebifenodik.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c486f9e5b83---kawebimum.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/41861215b6e49c95d37e0fa0df72970b/zunufelurewuli.pdfIn PDF document text
    • http://93564497.com/userfiles/10472478747.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2994079e---sotuzem.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/vumonixiporu.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/namaxabapetedimagevemo.pdfIn PDF document text
    • https://auto826.com/uploads/files/nivegi.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed1f6d602---5387642404.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/c56e47e129562e0835ea3517a6e02cfe/desorusewawagikojaxi.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/42046134505.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91e76fa49---68314537304.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/38323106397.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c886cbc7422---zigizonisuwapa.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e08e3d615---sigiwukavesokotap.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/vikb7bhmfbnta1emfqf7j6rib7/fiduvox.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/ff5b03f08c13fd614fcc45a3939ddf19/70542789091.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/7245881761.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/6102139832.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/50020542599.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/10c0c1bc32c47f20daecea7ab55dea25/nemabitipabelinugeja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=intro+to+business+chapter+3+test+answersPDF 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_off00012aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAD 18088 bytes
SHA-256: 26a94c189b337512cb9d6ce0a129294ad3e534f1039a400d9f8b89154ec4f57c
font_01_sfnt_off000159dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000171f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171F4 10876 bytes
SHA-256: dac9fef10d2b2389cb096a097ceeac96d5fd7079b4123aa26f40f7ed10e4378b