Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e00978a549e78c…

MALICIOUS

PDF

86.7 KB Created: 2021-07-13 06:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5f21333d227cd16ab988e84510f94275 SHA-1: 04f8ac643e9813a3b5751f4b9f98b245030617e7 SHA-256: 44e00978a549e78cfbfe6e870916d1feeb636491314c8410c037838328fbb62e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d98a0540ff7357d8dbadef7d801fd539/mosil.pdf In PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607819883986e---37534831862.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/93935519779.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/mubilavenunokenogejose.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/95866883603.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/55415264414.pdfIn PDF document text
    • http://nsureunion.com/clients/71556/File/58725180125.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160713ec361e20---wuwelonesuredoru.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc04889dad---54567876462.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/68279604702.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/539ad4ba4c5c9022d791fa6ee2544aaa/15671237318.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4fce2944bfd52590979defdbf818ea8f/xapuvugaxagiz.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/37504031666.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/60228657340.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbe2e64cf9---94479816679.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e756954475e---36785919921.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/demojabmu45pgp06j35vtkfst6/mugeliwizepefegutegurix.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210626040539147.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/divese.pdfIn PDF document text
    • http://maihome.hu/admin1/file/gatiterovijenobuwuminezu.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/xokefijanikinofemusag.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a52c5661c1---26017050132.pdfIn PDF document text
    • http://mebco.ru/images/file/rabajo.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/gomamuwevarodot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=beautiful+flat+roofed+house+plansPDF 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_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 17744 bytes
SHA-256: d40a807b426d004feec4a0e1ee05baf54251415b63613a4203d3093fe3b4539a
font_01_sfnt_off00011c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 10748 bytes
SHA-256: 987217215ba41f0e3f4a0278669a0dc35f17c6cb7a75d5c21ee6912c517884e9
font_02_sfnt_off0001351a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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