Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28c6b083cf5673e…

MALICIOUS

PDF

95.8 KB Created: 2021-07-27 22:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fbbda1048bd9f8b8b3be1dd3a83336b6 SHA-1: c7e30fc6a35f9bf9950adeeb7b198fa656131d3f SHA-256: d28c6b083cf5673eb19ab2d05e6b88a7ede2e323668ba1b376fb49199f73f83d
96 Risk Score

Malware Insights

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

The ML classifier and heuristics indicate this PDF is malicious, functioning as a link farm. It contains numerous links pointing to compromised WordPress sites, likely intended to host phishing pages or distribute further malware. The presence of multiple distinct hosts and a UTM term redirector suggests a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 5

  • 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://amrapalispot.com/userfiles/file/ruxuse.pdf In PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/qio4mviehnhctorb96m5crnl5i/vewejulomijivapumobunakas.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df8c7f500fe---44967086438.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/fe03d67267415bb712b20cc7728776db/70774608624.pdfIn PDF document text
    • http://fkhd.cz/data/img/vipes.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/bh7uncj8gvs3fsdn6hv4sj14d5/gajojejelijusufenep.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071b52c56163---zizuwelaketodosis.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef0cd2cfa5349707f0fc53e79e9adcb5/tozipol.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/40100443265.pdfIn PDF document text
    • http://teplospectr.ru/images/files/medawaperobugiwobukowu.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/wabifikudonis.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a3540b9d501---45063723963.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b66754698---8644778080.pdfIn PDF document text
    • https://bselink.com/userfiles/file/25987298481.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/fe92dbeb4b57d13fd92cd06fd5dae4b3/46263762229.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/69447246040.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/69209053461.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b20a05be380ce0a591990f1d5ac2b5b8/28179724845.pdfIn PDF document text
    • http://954move.com/clients/4890/File/15468725232.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/punomesolefolazevimekile.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/71491582762.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/kirab.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/zekizuvedapo.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/28753088623.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb4bb8824f---52852016263.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/kubax.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/nubaremirejejovevevew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+annotate+pdf+on+onenote+ipadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 10252 bytes
SHA-256: c4acb517b4ee78f90a03e78dd58ee563d81e27eec88dafc2f1344a58f84d3249
font_01_sfnt_off0001171d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171D 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_02_sfnt_off00012c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000144ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AE 16500 bytes
SHA-256: 0e59036adec92e9d8fd9cffc82c97c3568238a2cde10925d9a298e587f39d46c

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