Malicious PDF — malware analysis report

Static analysis result for SHA-256 828fcfb72c26d5ef…

MALICIOUS

PDF

91.9 KB Created: 2021-06-26 21:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d667cae9a4deb28f9a0c567e0e1b3397 SHA-1: b7d0c746fa1dc21b43414c25c47b6ad875b20db6 SHA-256: 828fcfb72c26d5ef88338ae2ddc388f4fbb77febb9ac167d68c00c50379e1914
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and the nature of the URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160afd08932f03---34372312205.pdf In PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8624ecf4704e28747ad7730ad406a8ed/32086057757.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/timefemumisifulipukiv.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/87712233209.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/926c754ea366fe085ca4f2b1292769e8/xudedet.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/fodinikawisolawaworeto.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16087a722d3e51---34757147100.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/xelixutesirawewegoni.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/27a1b755b7a00c9ca71862acf26ae46d/77471791653.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa35724fa---zifazarasazajuwajutoxu.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/10579bb18e85960cfcd705ccde45e8bf/54546692993.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/e81eef34794273db3e74a8475c70097e/60859423126.pdfIn PDF document text
    • http://slsnn.ru/content/file/21011008855.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/52090781626.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781207e08a2---92028465860.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/mimaviwewamubabepulefiw.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084b64eba1c9---13741896643.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b7e07c05ff0f1c7ffa37efb3a803e9f6/wivunuwasunemap.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/54214911982.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/winujonirinumisufurasatod.pdfIn PDF document text
    • https://highrise.pl/file/binebokuv.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/64dfa051711baa6d5fccf37c90fbdb4f/wobodadurugapevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=harry+potter+chamber+of+secrets+full+movie+downloadPDF 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_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11877 11380 bytes
SHA-256: 9ad89712ad561dec50ed2d43bd95c442f239b86139563d909c798550741a0908
font_02_sfnt_off000132e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E5 17900 bytes
SHA-256: 0dfae52c73289959b82828d7704b92697dfaa3358c1e38b5d7121bbae8bbde7e

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