Malicious PDF — malware analysis report

Static analysis result for SHA-256 069b536469fda931…

MALICIOUS

PDF

94.7 KB Created: 2021-07-15 15:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1009deb755e771e7788c1e67babfe863 SHA-1: 28637ab138bf0a9576636262fd7147a7e69b4241 SHA-256: 069b536469fda931d7e958dd31bcfd6c2d19c1623a13f5439646869711293683
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, and the heuristics suggest it's designed to lead users to potentially harmful content. No scripts were extracted, but the extensive use of external links is a clear indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://cructi.ru/uplcv?utm_term=in+reverse+phase+hplc+there+is PDF link annotation
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160845c99f0b1d---rufijivaxi.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/3f7a6047ca9d2693281e737a7b9da499/63663010349.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/peponigepitemipigip.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7d6437e00911ac31a4dbfdc45a7218ee/39595439235.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7c7e3c34c5ba800904128db09349b879/52685806649.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/revuvosewapo.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/50080013160.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca236446bc6---87755901736.pdfIn PDF document text
    • http://slsnn.ru/content/file/xumudisosafor.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/roliwabupi.pdfIn PDF document text
    • http://dakmet.pl/upload/vesetutebefez.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc24fc6118---vunibovut.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/37907685533.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/zixepetapakesafuxenemade.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094ed2ba0d3f---17584969115.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/jevobigi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd66aac7a67---26055162385.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/98007092050.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4143a3e83---zebujukuk.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4128bbf499---13433455249.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/531936818c3b0cabe86861725813311b/pafivozufurajineriroletid.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kelugogubil.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d150eb81f---42736574230.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/xelomidiwogifi.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/61692058366.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_off000110bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 10368 bytes
SHA-256: 7656822068630541317fbf13f6444dc417c163102470cf23ea5c581a5415d026
font_01_sfnt_off0001281d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001402f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402F 17416 bytes
SHA-256: 772b83e86134391b186023a42133022674edf1194543882bac125e4391103d47