Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a6d473dd1a2b80…

MALICIOUS

PDF

84.5 KB Created: 2021-06-29 01:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5cc5c227deaf533a398ce2832ebee636 SHA-1: b996ecc7cc9ec8d8349921ecaa8e499b98169a34 SHA-256: c7a6d473dd1a2b800394b1d54fe3fabf92852c430baefb8c6053e8c61f98e07b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to manipulate search engine results or redirect users to malicious sites. The embedded JavaScript is likely used to facilitate these redirects or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=apa+citation+chapter+in+a+book PDF link annotation
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/396a2a4905c0f8f01a083b247c97d226/nojebotivuf.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/87290469e30a76c41cbdc7e5e3fef3c3/pexosimigajunerop.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210530034405.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/1499be61e24daf02dd40724db52f2a71/foraf.pdfIn PDF document text
    • https://noddy.nu/images/file/lakidunupeso.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/le9n9fgo6cu3ef9uv2bp6sq62r/87799349428.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf500b3db49---fojotamemezebasewer.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/aghh91bgdrpqlu3smauefsnfe0/lamefevexamufim.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/tekibezifupepufidimuwu.pdfIn PDF document text
    • https://x-software.cz/data/file/vakuxazorotepafetodifatu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/krvhuhqqqs9ul1nchuaessmckj/68833977881.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kikikibaxefiwevujejuler.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/binix.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/dosoxabebizi.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6efa43da---vizabij.pdfIn PDF document text
    • https://tmtteks.com/files/dulexirenigero.pdfIn PDF document text
    • https://migger.dk/userimages/file/61388210167.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/93969694034.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/bikozisewewusimosala.pdfIn PDF document text
    • https://ferropula.hr/files/mazigejenisawa.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/gedimaxuvonaw.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/lagiropi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vcj4jr8flifq2obln4rmcld0v7/fabakuza.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_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 17220 bytes
SHA-256: 163bae33b3294106286298dc6bf7930d86d927379111d7fd10f9c3f7f46a89a4
font_01_sfnt_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 10468 bytes
SHA-256: e776e531f852b473b53a9b20b3d4d68149c421347b260d8b0f4f662cb02cd7a3
font_02_sfnt_off00012c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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