Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df5e836c0bcb6a5…

MALICIOUS

PDF

85.6 KB Created: 2021-07-29 21:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 314c3a9b833d739a9f8fa3dd2dd318a0 SHA-1: 17adc7519edd2808b7856774d86eb25d4ce6d974 SHA-256: 3df5e836c0bcb6a5b241743f915bc9e3bb3c3bd8db11cb434b7cc08b57ddc388
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of multiple PDF link farm heuristics further supports this. No scripts were extracted, but the PDF structure and external links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/jc01te3ijt70s3looqlubvfeq1/jotuvujuvuxe.pdf In PDF document text
    • http://medob.org/SITE/files/editor/file/lavegovutev.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c734f43925d---1188825024.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0360fc54e4---70360623360.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/72494954880.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/lubonenesavefit.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/86411674232.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/keruvifedamatote.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/hhd7skb6ab2rrnjkfmgsj7osv4/5179388602.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/51210241331.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sj1p4da5qhfkjf21qd6tfih52o/ritatop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba834f74689---92660194481.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607121592841e---julomidafunoxutiz.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/b2aeaefa45526a666c8a09b473137216/zikitapimujumuzit.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/nazosapirajo.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/4qrg54qa2hmisan7v39bql8v6t/dusixobererunojubagolivi.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/771669cf4550d00e7da7a567904fb3ee/getikagiz.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160942738bb5f6---35774328359.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a8045b560---kugijixuxamovitetexigobaz.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/bcbtk11cppp0degk95pvnoedd2/melorotovewogipu.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/lijemirerunujur.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa9651e2d---duwizidugotevun.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/vimimizewifozegakipal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ejercicios+de+decimal+a+fraccion+resueltosPDF link annotation
    • 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_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 10852 bytes
SHA-256: 56a1d4fb1788cf962fba13a8d2dc2e9f054f5689b89131db81251978d1e38f25
font_02_sfnt_off00011e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5B 18640 bytes
SHA-256: 20454807870b45b5d2962a5e8a25445b983f30dc42c40560684c370632fe68b7

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