Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a57cc71c0942693…

MALICIOUS

PDF

78.5 KB Created: 2021-09-02 18:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a7776f34288b225a8004d9bd2ca4c4d SHA-1: 3778743ec042b4b398b8cb359beee6e05755f222 SHA-256: 2a57cc71c09426937da4bb1a6f15c70685b17562692006bbd74420dc20b735a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used for SEO spam or to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it could be part of a phishing campaign or a content distribution network for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f1678aa617e---3106597702.pdf In PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/dilosumatudar.pdfIn PDF document text
    • http://billsky.ee/files/file/fapovumarawuj.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/gexox.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f50058f8b8da024236285d4ae97bb176/kavulunezadojironizow.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/86110850950.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/nodopuwusolabejimapotum.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/xijezojeliritujot.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ce548dcd7e5638aebab80caac3933cb4/gojisebevosixufepe.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/figimuzomifomujizotinito.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ldc874f6ngle0p9k46u436nndo/gojelozuw.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/mrretg944g76c643nglk61mi04/ritevuwusumaxe.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ov4tdb9s5jkpsf73hcrjcbd7g6/logutezawobivut.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/44805824798.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4d8bbac67---gunelozilemivakesese.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/43487055630.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/pujeveburaraw.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/timur.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c52a738c6d080188ee83f486ca2930aa/29941161409.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/13250707681.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/fesevobabuzakolatuvuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+manual+bike+pumpPDF 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_off0000d436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD436 15824 bytes
SHA-256: 357ca23da3316738d3e8dcccd16ff3cb3524cca7d1043f916b76b2487fd8a0a5
font_01_sfnt_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 10576 bytes
SHA-256: 03c7670a57f9cd65115ac7d788b3d251ceb6ea756a27d6b653ec8c2cb1aa25f0

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