Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81b07f15320bf7d…

MALICIOUS

PDF

102.8 KB Created: 2021-07-02 21:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 219bd12f46a0d2e5198bcfd7ab10eed9 SHA-1: 3e3e21cf4137c15a2c3ce7b1c2c96e8e7d5a23e8 SHA-256: f81b07f15320bf7db3a6a131986b9deffa76eb8fdea8014f636a5fe238dc009d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites for further exploitation or credential harvesting. No scripts were extracted, limiting the analysis to the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/uq4bu9j5nq4s7j5p9rebrbcqqq/58015418772.pdf In PDF document text
    • https://dichvuketoanvn.org/uploads/files/togajexuteresan.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/dbsd5pu1jqp9lcdb6fhjlvk720/96190190180.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/6bd89f9297c3274ed7ca3ad5146dc08e/46394345287.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b587115eb---wusabibewumubetosa.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ee6f48fcb---rimesununizisata.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608567fd04aee---15104381932.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a78a967c0---1741480601.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/br5m18l05a242per69064815u7/levulitugagureferesareger.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/fupezexomidutedug.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/05d83fc746c9ae2c30aec79f523b4c94/77460521221.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e97a47f336---zitawa.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/10009833673.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/65864010730.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/13544171418.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc79d0357ff---66161380784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=solemn+painting+animal+crossing+new+horizonsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 21988 bytes
SHA-256: 7e80fef8df2dae79e7bf160b8119e4fd2d906fde886f6369d562a9f46d4bb330
font_01_sfnt_off00013209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13209 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_02_sfnt_off00014771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14771 4956 bytes
SHA-256: 284f65dd85542e148b5dfcfa14fab1d3924c055bb8fce6ad4b5019a8e554e7f0
font_03_sfnt_off000159e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000171fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171FB 11040 bytes
SHA-256: f97dad20b0a041f9b606d075714d76e2df2653437d44e70f910ff3ca1ffc577a

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