Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3772f4bc33b994…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 06:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 368671cf61645e693c6323f2b280f3aa SHA-1: c3cde57a0d65cdde2065f9c56798339b6c676771 SHA-256: ed3772f4bc33b994b6adaff435b6a2b411a3344abed730d0549c07c41e53c9c8
164 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities and delivering malicious content. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and other domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26c80e0cff---josuxotos.pdf In PDF document text
    • http://sk-massimo.com/js/upload/files/pusudavegejonutapikufujej.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/vodafopo.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/gareremememob.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6e80a3fcf---49179289450.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/mibajulavelopuzireli.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/19945862818.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/90ff90b307435232707906a7377a0372/59792669520.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/60559465104.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/xulema.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021060909144773499.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a35c4e7b85d---ponawaxatolasexi.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/2a5636a4e0b453ff101c9487deb01b33/ropumedaxexerupomixowage.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/80592955870.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/65293483177.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/mukofefugari.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/35453588071.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/17797948804.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/217610383.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/13275910946.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/44966280747.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/620370e2e1ed729e8773c07bcc9347a6/xegumagixipelok.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c47b7238e14---11982029665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=difference+between+heat+stress+and+heat+strokePDF 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_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 16360 bytes
SHA-256: caff403256ad5b0dab504f331f54c2aaa00023d41288d17dee35c949efdc2f5e
font_01_sfnt_off0001113a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12951 10848 bytes
SHA-256: 26f3742c17a8d2868284423e53b965fb2ef0153a2cbf1519671f141788c66158

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