Malicious PDF — malware analysis report

Static analysis result for SHA-256 445b8b7583aa11b9…

MALICIOUS

PDF

83.6 KB Created: 2021-08-12 21:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-12
MD5: 611d7efdfbca4c0abe09e10914a1c06d SHA-1: 854a165fc7e5b8543c2970a98d04aefe3bd41abf SHA-256: 445b8b7583aa11b9b23542b3df7f7af577e68e461bbfa07e18606a6e46a34bec
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to delivering a second-stage payload or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://speckletrack.com/update/editor/file/71141015961.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1db48e16d---83700512945.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/xipobawumi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/lelun.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/89690240798.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/52984990170.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160983d610ecee---70756697229.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/4931396420.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/59224178486.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4554077f86---29306995070.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef322d742---64284671896.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/78159404461.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/rusujijenubivobogupuj.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0f114a08adfabe17d4b7bb93f20c51a4/bazimudobobepij.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073599a5a44c---33643511509.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/35640211013.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160735675f26d1---71190582615.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/25527923391.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/l6uc1vr0cqnvq9glto6t031sgp/45128728407.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/9d7b5b39e33ebd3d2f8960a42c96ca3c/87207221646.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/87639848371.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/rurigorek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+write+a+resignation+noticePDF 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_off0000e75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 10436 bytes
SHA-256: cc453bee841b87d1c69687805ca45b74d3e641c71963980c6fc88d85967c061a
font_01_sfnt_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 16268 bytes
SHA-256: 0ec8696276f3f398767c4cf0d04295dfd9f24271c8dac2eb00fde69d060eae6d
font_02_sfnt_off00012937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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