Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb7b8e832880059…

MALICIOUS

PDF

70.7 KB Created: 2021-06-28 01:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c4c11785a0a69132b38fa95223b25a87 SHA-1: 8a94e2d76bc00c2e0ace8ef8528bf60c38f02673 SHA-256: 1cb7b8e832880059cfeff3af8c99170457f41c59ac514c2e8bb49143ff3c7181
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/440mc6svupo1aaq0sk192taahc/85669373371.pdf In PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b4181059b---vipezefo.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/41571519353.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a66ed67d562---9480370452.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/92714239286.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/86032914725.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/be47113744d29b28afe61a037d020628/13201660076.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/remegamabageluzitabafobij.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ece3cf203a---sudalujilojegegiderotavet.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a17f2aa76de---sokefonuwevinurodul.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/79f0bb50c4961afa3d044fe38a9ff342/71650531841.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/41095453139.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/sebijimerabuwemiluvewim.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/guxovowanobum.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/70434483190.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8f8040e052b57ea956669f2847ff8da8/poberedanosepedunesugi.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b20c852a82---merutetajezomut.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a4aad3e86e8---67408838327.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/ginibebusumese.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c47517c1c53---wizimakafemif.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc42e1c7cb---26607661975.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2f5f8f02338d7d5299a953ebbf34887a/fipijexox.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d1c6536d0---36254358771.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210618155428139.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/gegodudefen.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/6fe7cd22e0f5390d67b762bf9aa858bf/koluzetowatoxobukojigo.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/1159757720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=r+remove+rows+with+naPDF 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_off0000b7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D9 14772 bytes
SHA-256: 2b632941f071b503e4b7c1eab74af7ca7c80ad07a65dfa978cafa6389eb40a71
font_01_sfnt_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 10524 bytes
SHA-256: 806cd77c7d5a5a9870371426bdafb66a2fce6e9ac00b4cf0b5112b4148098aa7
font_02_sfnt_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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