Malicious PDF — malware analysis report

Static analysis result for SHA-256 44561cdab0069cca…

MALICIOUS

PDF

81.7 KB Created: 2021-08-31 21:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-12
MD5: 574aef79cbe66091497b3ef986c40212 SHA-1: fbe912e6a215f42e35ed7e4ec96af9e77204841e SHA-256: 44561cdab0069cca07721341d8c89683737909fa17d63310111e1f1da1953c94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, pointing to multiple distinct hosts, some of which are associated with compromised WordPress uploads. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cuiquji.net/d/files/87492391002.pdf In PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607924d7b5911---tobibabare.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dca76cabe---madeponuseburob.pdfIn PDF document text
    • https://proia.bg/userfiles/file/duxozatilevipa.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/fesojipuvozerekadifetamiw.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/jowuwunenizumowexedetoso.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/43181171877.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd3fd3116---6801887490.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074372bc0318---9077444384.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f93b3d3d0e54ac5c387d0ad9cde1042a/71592517992.pdfIn PDF document text
    • http://ipllaser.in/uploads/57243916319.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070588559929---18367699613.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/68178871685.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/65522351969.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/30611934279.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/19022875920.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/lokoxebu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/mhdt1qi3v6vhtupkaepaddvm02/82420585599.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/sh4vebvge1ekiipqpf5l220lf7/bimodeseteg.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/22177657497.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/fisodozekewosob.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/kuparo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54c53d9cb4---ragapojunudidodofize.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/72049250163.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f17f919b5d0---bekatijalumemiwemudo.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/sisogowaniror.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=wearing+see+through+clothesPDF 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_off0000da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 17884 bytes
SHA-256: 2d9550276d13a7957d88069f0ad29c39d849b93325bf661aa1647534134d05c1
font_01_sfnt_off00010964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10964 10604 bytes
SHA-256: 7c829a63b2c0d456286ed9869cd9a2b29e5cd80b786cbaba38b6dae39cb5a8d5
font_02_sfnt_off00012198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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