Malicious PDF — malware analysis report

Static analysis result for SHA-256 928e638fe6d00440…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 02:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4bbd89f330b693d8d9621b9c15b5f59f SHA-1: c4ebae74922d3957adbea63ada7ccb0fdca5432e SHA-256: 928e638fe6d00440b0c40f694d20432ea8ac30bede2fcf1070a76af163d364b3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm with numerous URLs hosted on various domains, many of which are likely compromised or disposable. The presence of a link farm suggests an attempt to lure users to external malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1fe9e2311---77265652663.pdf In PDF document text
    • http://shanghaicruiseparty.com/uploads/file/nelaj.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/24572959021.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/netujijekiv.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/mabanakuliribavorosogaso.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f59a99aa15b914a562677eee8cf7e9d6/rukorawizitedebibovaze.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/pemojizowiwarufenom.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/vexoxovodimana.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/98499461785.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/46266418114.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/11787463885.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bac8dc54d61---2545918061.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ipl427mvpqmam23p29umjoule6/17604758798.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/ximakumagona.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b5112b20fdbe4c8f6be778437f5caef6/tisaliruzaxafidupuwidor.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/74776492197.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/27200836170.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e86681c4d---wivagenepawow.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/bupepe.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/wimupunipamavatid.pdfIn PDF document text
    • http://abpaluso.com/upload/file/duwomefetise.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/99639739154.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/005d6293e0af0a95026e30cacffbf110/40283361920.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c7dc5a49---nisiragiw.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/04fe60fe80a3ddeb9250cd0a2251fa47/samagusabokavatuxomuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=avr+microcontroller+datasheet+pdfPDF 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_off0000d012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD012 17656 bytes
SHA-256: aa9ea860c3472e1220c00f1b7042676bdedca86dd9f06b2db8b5ba3ac10475be
font_01_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D8 10932 bytes
SHA-256: d6f031365351c2d6e5ce0a1f8c22f46d2006ddee455e03cb88e4ff8327c39b09

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