Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e426655253c6616…

MALICIOUS

PDF

73.2 KB Created: 2021-09-07 02:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 06eebc6bda32a4790becd97826070a28 SHA-1: e323823340d8968e44e8f52a4f0ca724480e1291 SHA-256: 7e426655253c6616295193e64b337b69f674e78481581ae73a69e98f3655c9d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://lovelyspa.net/ckfinder/userfiles/files/92665981091.pdf In PDF document text
    • http://energy-labels.com/userfiles/file/62659521512.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608121fe13e72---38184936324.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7eaaefe54---puxapo.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607465c49b4ac---wowulozomoput.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/1406945063.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/2153093569.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/bfa9456580a03cd1bcd1213bcada7504/bowapokij.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/0alsm3h3uikca3gnvfkslhj91o/86577194745.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/650d9d016bd9bf2c31d9896c306898d0/93083180434.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/855499224d8f6e9bc6e3a06e0207da37/feloluzil.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/pobaveguzokipadorom.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/famike.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e131d4e2adf---tuludixebebujijorudo.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/16762106510.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/12686458720.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/7c450e1108afe0ac16a85193c1928fe5/45851164355.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/betepebujemegamililajisuj.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c3d27f97a---39603583374.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aefb8c57a93---48992266841.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/lududimuliwuvil.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/70951371771.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/piwagutubavakavepisibevor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=glutamato+monosodico+y+obesidad+pdfPDF 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_off0000b881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB881 17080 bytes
SHA-256: 3a7795fb18d827422387f7273782733ff265a176e27f960884e17c831e8338ae
font_01_sfnt_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 11072 bytes
SHA-256: b96cba93df7359c0b20b6fb748760d0847118ed1377d86dc1ef7efac9c20a20c
font_02_sfnt_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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