Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f4c1d5911e4d24…

MALICIOUS

PDF

86.6 KB Created: 2021-06-28 10:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 9d5614f90aae9aab5401fea5d6489442 SHA-1: ea3f3a3d70bd681106974c6019b4e770879a0e95 SHA-256: 28f4c1d5911e4d2490788bbdc587e4e00250a6cb98732264803cb0f2a07e9265
216 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains multiple links pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of a 'Payment redirection / bank-detail change lure' heuristic further supports this, indicating a likely Business Email Compromise (BEC) pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/7shno4lrfamsp7chab5h1lnjhc/3182803767.pdf In PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/78ikfi21mjmmr7chbk8b5r2ir6/33371809456.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3c9eb53b4---60872995759.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160d5019b02ed7---1154229878.pdfPDF link annotation
    • http://allycatering.com/userfiles/rilovodupawikaleve.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/gegetuwonupixigox.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/4363555715.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/p7p96j2vu5r2spqlgoi1i77k64/xowajavizadavinaxuvufapik.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/202c33b5081aeff519304bf9ebf52200/lunezu.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f3441c711005613078c7fbfd518a6fb7/15850839158.pdfIn PDF document text
    • https://tangentemag.com/img/file/34907069360.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f6b75a13b---17741360977.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/25338932151.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608dffc175736---61913207223.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b57a3c7828---karazododuvuped.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/hm4c3uk0rfi0nnvn3r2j2fgn12/putaravuxolokig.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/11966700791.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160703fd42ba38---61741424884.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/tosovapoga.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075974f8c724---30345941338.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2c5b25c94---koriwekumefera.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/80415afe29f6b90dfd3ec330fe0da596/vepafodedivotufe.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073ac9ae00aa---zavowutujoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+mine+cryptocurrency+on+androidPDF 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_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 16876 bytes
SHA-256: ba278b7a7edec5cde4e4c82de6547bb0e30790dc6e0e04d0752d22c33544fb7a
font_01_sfnt_off00011a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AC 10752 bytes
SHA-256: 6476d542d4356e1a3e2c8315656e9e36691d7525adca186755fae98ac0522333

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