Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42152716118b921…

MALICIOUS

PDF

92.5 KB Created: 2021-07-06 19:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 99f25a4403a65de4d9f17428a36bb50f SHA-1: c69eb99a984e183f38d4cd60b0f8baa5b628f857 SHA-256: d42152716118b92115997b71ba3c43823a92a7e1401e09f04557b1be2cdbb880
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised CMS sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm suggests the document's primary purpose is to redirect users to external malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://isdoor.ru/uploads/files/86950398785.pdf In PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aec41497a9---39583076525.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/digokidexagulibam.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d030ec21f---xebeze.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/90315324460.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1p75bk53rrojeqqlnv590lujp2/60630282431.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/vuzevuzuwefovotakobedow.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/papadamoxivanidujuw.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/50739241471.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/90798765788.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160894c80828ee---14240760032.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/defe2cuh47t1i5ou3o6lo4nk4p/benododuxipatuzivonulizom.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968e27a29ab---puxazojonesuluzisew.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/83b6330dee81efc65ea1f0555e321add/45532575570.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bed31a5e0ed---mewosuzazimizuvu.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aba6b1e93c7---kasubafibow.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160de7e780ac04---21926392938.pdfIn PDF document text
    • http://altinay-law.com/images/file/rarejopurit.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a417d84e9bb27924a3eda2efa5d46b00/fopolifetimifizubanodofuz.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/sexizademororobirezega.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d00f81a4b15---16104082744.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755a444b3fc---pabikeposulazetimedida.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853036a421a---vesuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+do+the+woah+dance+step+by+stepPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 18388 bytes
SHA-256: fca4038cb2c770c1fad6381f075bd7284c5022d566135cb3439e0aa7c5bf9ae7
font_01_sfnt_off00011ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BB 10704 bytes
SHA-256: 8dc5ca52da34211b6272dd9a209431b2f57bfc855b2975149ecc46fb95238121
font_03_sfnt_off00014d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0B 16740 bytes
SHA-256: 4f8cb6402a9bba66e577cb3a68d155323c53095c07f7f7e0187bfa60205edc97

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