Malicious PDF — malware analysis report

Static analysis result for SHA-256 3537119f8a5be3fa…

MALICIOUS

PDF

68.4 KB Created: 2021-09-16 22:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-04
MD5: 7040550fc5e40827da3bccce0db31ee5 SHA-1: 3cf434d3a39f3b6a4c7692078e83df74e31d83bb SHA-256: 3537119f8a5be3fa7e4fbbc52c1f7257f60fab0038950e2abbceb7ce07026b39
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a full-page image designed to conceal clickable links, a common tactic to deceive users. The document embeds numerous URLs, many pointing to compromised CMS uploads, suggesting an attempt to host malicious content or redirect users to phishing sites. No scripts were extracted, but the presence of embedded URLs and the overall structure strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://itscebu.com/upload/file/20210910092356.pdf In PDF document text
    • http://hijoin.hu/editor_up/vovasukaxikek.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/jovuwofamepisanir.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/gajojutewonidaviw.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/nekigisegipoxul.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/61495233129.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/webapujolaxemobakebut.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/49996304402.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/tikobopejibojezirukol.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/feravololimewel.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/73469209305.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/sazivoxa.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/619a23e31a1da3ecf63098329dd7830c/wuwiri.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/96af834d1b61eedf6236d61f2b8bf586/87629278015.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/29071191469.pdfIn PDF document text
    • https://kerryparsonsfoundation.org/media/file/valosulofujejasopuvopise.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1b926fb8122cdb2b5c93f13394a119bf/3285706584.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c01b1a36e---6987803260.pdfIn PDF document text
    • http://fitviewer.com/files/file/18354280716.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/xofupokipagedizinofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+access+to+a+private+instagram+accountPDF 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_off0000afd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD9 13976 bytes
SHA-256: 55f20fac90d168eed23387e01de415977a478e56e6d7c981fd91604d530cab7b
font_01_sfnt_off0000d266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD266 10916 bytes
SHA-256: 420c91004b1e65a7bc5a026809269df3bd1faa6f33296aeada571fefc0607359
font_02_sfnt_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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