Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0503e912397ad39…

MALICIOUS

PDF

74.5 KB Created: 2021-09-02 16:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 829a3dca801651a784dfac37c2237a15 SHA-1: f3cbfae4b83b447df4ca54c5318cf9db250d644b SHA-256: a0503e912397ad39501a64ea942bca39cc25f33a4d32e97017e1771d3b6061f9
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to other PDF files hosted on compromised WordPress sites. This suggests a multi-stage attack where the initial PDF acts as a lure to download further malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7d9744fe570b1165bbd21af44ee4803c/silobulukoma.pdf In PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745543d222d---famodiranujadonimoxajon.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ubo9mlf7pgd6kj761bfik7i9f1/vuserelijikosamefesiwata.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuwogekatagasiki.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/48939035591.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/lazakuvikakekeno.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/8f19ce5e298921e70b6a07b4a642b9f5/tebowive.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607661377781a---tapadarafidop.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/57755877333.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/egk8ecv2qcoggd4aoka9frvrl4/56700508436.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/funojik.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9add49937---rirepilimot.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/86565126293.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/jiwes.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/xekejamukoditoju.pdfIn PDF document text
    • http://beateromer.com/bilder/file/42312380890.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/lanafenupin.pdfIn PDF document text
    • http://kotolantopeni.cz/file/livotavun.pdfIn PDF document text
    • http://uhorder.com/upload/files/23783554461.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/49532141632.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bd46dc9e1---40375105447.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d74fd98f2---tetukipotoxaguwekade.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/37168589627.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/pebiburerisuxodefajij.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613083954e94c---68693619407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=nth+term+sequences+worksheet+tesPDF 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_off0000bf80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 17336 bytes
SHA-256: b31d165aeec2ceb49d9c37f7b137f3884c6891493cec4810f1652bdb8acc57ee
font_02_sfnt_off000103d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 10596 bytes
SHA-256: 95b98eec2f7e1e4aa6252b755f2994a74a53a5fdd4af2722e6beec1a9712e5c1

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