Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec1abcb202a0726…

MALICIOUS

PDF

89.0 KB Created: 2021-07-03 19:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 053a83f64aa4a3c18796c804c5b6a705 SHA-1: a5c24c9d040407bd29742a3e7a1c9a19251eba91 SHA-256: aec1abcb202a0726b2735ae8448fa4ef56b41cd3c5dcc5c66c605e1136147671
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting, likely serving as a distribution point for further malware or phishing content. The presence of multiple external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM firing strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=scalar+principle+and+unity+of+command PDF link annotation
    • http://seksdagen.nl/userfiles/file/dejugozaxunipelan.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zixovukofegasozomid.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/480f692419a6c7877eb6fa59b94acb7d/bavifafibilimofilal.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0bca3e7e9ed269b67b3a3573f59a022f/wogaxiji.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/74594e40d7a9b78d6724f76285fad260/47600079018.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/39469622873.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/5ek50nqgc02bjb3349278qok84/19588022303.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/34827127728.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/zewivizibasif.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/66368894085.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9cef2601---zixovam.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a396d381a46---57014302102.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa9a6cc878---10587462850.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/pc2096ucin17dtovb4earjvgv2/rifiru.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c2b0955f---temal.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/12034765430.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c35b05f2a4---mojosadebadopakatelatife.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/64107697082.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/wenajalazetexufaju.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/c69b6c68b2047bbd03ba9d5e15e8a8e0/defajidovubezuzosojoraz.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a09e54fbbade8d8df5098b2e0509b522/33136978088.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/83170409211.pdfIn PDF document text
    • http://yoron.net/up/files/72101971717.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a99e6959458---kutavozadigow.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_off0000fb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 16504 bytes
SHA-256: 2fa304d6eb2bf41df33a6ca122319353967ee085b0f311f5670d36c510aec06f
font_01_sfnt_off00012559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D70 10904 bytes
SHA-256: 33819a25a0b040b96e360bb34a42eee68991cafbe8e4232ac393527014f4a3e5

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