Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88057458b9f3af4…

MALICIOUS

PDF

165.1 KB Created: 2021-06-29 21:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 5e9286a90605dc1f36e0e9d3646b0890 SHA-1: 6541bd8ca75d9c8ef203594841647fa94b2e4db2 SHA-256: a88057458b9f3af48d3c03c1d60c297d7c2b5df717cf0ba3553ebdb9e70b6109
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of an attempt to lure users to malicious sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9735

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://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/60b762917ec36930020d832dc68cf59f/47981057060.pdf In PDF document text
    • http://asijskepotraviny.cz/files/file/38768584575.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/5fa45dc67b642f55ecaf33aadd30dcd6/93270650214.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/24f6d8e0ab0d0b17eec57bbe95e58b64/92927229750.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/bewefiged.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/87320337595.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/38736852822.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/17070610631.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/wasok.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16218994538033.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/40445293834.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/97602927668.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/jegakagisexuji.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/2m6r233f8gphjmhppnr950ogp6/rivometodup.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/mku9cnm3nlrkgnqh9kl755rp11/fapedagal.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/kupubepeg.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/96920597040.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16083cae38d506---tawuxomujuj.pdfIn PDF document text
    • https://quaint-house.com/siwaxipurarugotopuba.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c24ef085be---nofesep.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/7375787680.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/qi646i22u4jh08p49fk8aahe8t/52168787487.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089a87c7cd85---toxevebip.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde1f97ca9---76880569955.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c5c77de65---47629263016.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/38367940771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=explicit+bias+meaningPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002264f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2264F 18352 bytes
SHA-256: 8858be8ed1c393605d0059df69a5b4fb5856f01d75e4cbb50ccf5c23e841c769
font_01_sfnt_off00025628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00026e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26E3F 10724 bytes
SHA-256: 9512ddf867c54f3e6fc2635e459f6ff16d86bd7ffa09445fb24b790a38696d73

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