Malicious PDF — malware analysis report

Static analysis result for SHA-256 442cc03fe30f17ba…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 04:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 114f4db3f921bd48349064577afd7db3 SHA-1: b329ef0cb6e3571c7a4ac67f4936979b1f910b0c SHA-256: 442cc03fe30f17bac6888fd603068350f467e4781febf086e7b0cc960977dabf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of embedded URLs indicate it is likely used as a lure, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://medvor.ru/uplcv?utm_term=fuego+y+sangre+pdf PDF link annotation
    • http://uniroll.pl/user_images/file/tatuvolaginugefi.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161459d3b4b621---nuvojuzakevutidulurevarag.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/nerokuzesamidunopaduriro.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/xibowidajudevuzo.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/73280166670.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/kobora.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210909113252.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/sigeganuwat.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/luwokukabid.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/53297391391.pdfIn PDF document text
    • http://saimiri.name/upload/file/kixakelemenu.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/woderefogejaxurizukazomu.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/8810261212.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140208301bd7---49605711580.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/68017462874.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/tipata.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/15507583210.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/839c609c468bfde7908d0b29e8bd185a/6617724839.pdfIn PDF document text
    • http://superazs.ru/images/news/file/70338501189.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/72182133708.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/jularagas.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132719e1a95d---xipisi.pdfIn PDF document text
    • http://zubrcup.by/files/files/renubagunur.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/48826519155.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8cbf8cb05---96292723682.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/55031339607.pdfIn PDF document text
    • https://solturism.ro/images/file/vulelamojiweg.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_off0000d99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 19816 bytes
SHA-256: b235a028313ef69cf28436ced3cd4a1588b76988df5c594c5cf66a831a155209
font_02_sfnt_off000123d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D8 10628 bytes
SHA-256: 06621bf981a5a1210cdd4ac6032c33c28b3b17ada9cff7bcc869cff78ebea606

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