Malicious PDF — malware analysis report

Static analysis result for SHA-256 576d67d3a073f150…

MALICIOUS

PDF

89.4 KB Created: 2021-07-15 19:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3f6db7d4282483eb7a9a366de96d03c0 SHA-1: e78eaf5bbeed9654a20486395f7ba4add9f382fe SHA-256: 576d67d3a073f150b0f08408a74287c8f10efe698f3b729201bb7e02eadf6a47
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final malicious destination by using a large number of intermediary links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ce7c38741---zizoga.pdf In PDF document text
    • https://pjkconstruction.ca/images/file/xexabijikofuvekilidup.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/cf27ad9c6316077ed04f19adfef1f36e/fivojimavomakofi.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f74096298---91933173423.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/77748ee6bf66b1dcdc4aea2f98cd5ae3/sutavoweze.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/juboxi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/38443560720.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fe685953b1ad345450a046a392032b9/15969644017.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/kajojujoxute.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/87251364785.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/416054869d385e4de9ad1b62ca6663f4/sarerav.pdfIn PDF document text
    • http://geotersrl.it/file/36049328539.pdfIn PDF document text
    • http://citra.cl/userfiles/file/90141980891.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/sonadafinamaneragigo.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/41784882154.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/dawozakilexifu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3bd2a4fbe---beruzidive.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7eee8d69f258179c997c00ec64c9e200/lusut.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/373e8163eb8b210a33578b55046c148b/bojig.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e70d83ec5a6---vewudixuzosudebasufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=writing+a+letter+of+recommendation+for+yourselfPDF 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_off0000fd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 16136 bytes
SHA-256: a28395e60e0b1bd23925201cfd58ba63dc54eb0837a239f44ed08347d7f0ceaa
font_01_sfnt_off000126ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC2 11024 bytes
SHA-256: 91d756a2e9d3da323aa1cc1ba6f7a92674154047d7ddfdacd46bcd1cf271bc4c

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