Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34a95781eeaa038…

MALICIOUS

PDF

104.5 KB Created: 2021-09-05 13:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af4226956e5c50aeb21bc46e7e493fb7 SHA-1: 435e4af72afc2ba2191887e84fb92eeb44f9277c SHA-256: c34a95781eeaa03821881909e3c5b4064a4043521d68cbb0bcbca204c730004a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://wastran.ru/uplcv?utm_term=christopher+marlowe+edward+ii+pdf PDF link annotation
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dba2d47a0fb---dudujezokapinubipavu.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210612_0FFA1CC3B67FAC2B.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f062fdf0cd7---32899765072.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/dizaw.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/98704613348.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/67150410637.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1626938982janaxotutujadet.pdfIn PDF document text
    • http://lblussana.it/images/file/wimikulogofudip.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/36569544605.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/viriwujejujibajixi.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/18046754494.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cd93705a9---firobisa.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/rataxenodab.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/67289360932.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/15281375015.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/92806948105.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d965683e100---parikumofixerot.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/fevamobavebi.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/o5opjvk36c4dgis3ie3ss9asc6/92215690436.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad7189f98d---fozofowojowotasulibilos.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/611b470f83c57.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/41522305209.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/j0ngr8gh3sp0t9qc7cpf3fpkcb/wilagirapinefamujuduvoru.pdfIn PDF document text
    • http://boxethai38.com/upload/file/satakutewebudoxufebe.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ccf17a51fb4019e1f32d10126504384c/48138181830.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/234fa78b61764d6720e5dbf8da2c9d1b/nozubidodonulikitulupat.pdfIn PDF document text
    • 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_off000130e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E2 10776 bytes
SHA-256: 09c01087fc704ad4969eeada271e53929f33bd4c6af410430720bcd548ff50f4
font_01_sfnt_off000149ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E0 19548 bytes
SHA-256: 509f6b1e253282e75404e90734859a4894c1b72e32d6cf87d4dd70fecbd6b62c

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