Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc75a6753e39b95…

MALICIOUS

PDF

147.9 KB Created: 2021-08-22 11:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca026010260ece310b28e8466f12ae33 SHA-1: db620b8482c404d9e1fc0db979dfcdf2280b76de SHA-256: 5bc75a6753e39b95afa184671b8d670f4b215bf5b2b6cf75af413d613e93d482
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to direct users to potentially malicious content or phishing sites. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://www.srijonihealinghome.com/fckimages/file/61558456154.pdf In PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/wemuzejafofepedo.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/dotana.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/lojatafivifiwenajipodat.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/mafopifonujifax.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/72158609328.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2lrhg72r8f19ih57dh043m77ek/73468292013.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/32060539249.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/119024650.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/xoratokulupivoruw.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c54495ccb3b---lurejavuzepuw.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/lizumotugavatukipu.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/fupugutox.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c0904ad8---21095554424.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c3669ed188b0aad0894e5eb7df0dbf98/wasukupututuguxo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/5b6eed19f4db3b9fe009af0a02730d96/63811284297.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/66206616853.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pemiapsrg58rojkoqhjlr8vgf9/tepidokijiji.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/guxaluzaguxowojo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0aa76d22c7---gekininipenagasudexovi.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/1a0c188ea66d29285d6c8a8306b4f929/kisexuwijas.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088a8965e159---8301239446.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/lanafoniwu.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/633bb48af70dfb39dbb717714a1a96a4/33145930401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+did+the+second+great+awakening+impact+american+society+quizletPDF 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_off0001def9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEF9 11552 bytes
SHA-256: a530828a0733f5c6deb6bf611fded8f6b2e6ba12a7fa32ccada7847136eb2adb
font_01_sfnt_off0001f9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9B9 18156 bytes
SHA-256: 611d48fe30466c3d295d88d268fdc2d2ba1c8abbfbfe6db82422fa4fb9e5c3a0
font_02_sfnt_off00022933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1