Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb88ee753c9f67f4…

MALICIOUS

PDF

82.4 KB Created: 2021-08-17 21:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 637914ddb7ce4f450f399da0c42d6532 SHA-1: 8a60c0f8c4b63074af34ffbf35ea8c9839aa526c SHA-256: cb88ee753c9f67f4b40d32738b0ca3ca6463dad763b2c3f11d05c7520fa2d5a0
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. These links form a link farm, suggesting the primary purpose is to redirect users to potentially malicious websites. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://laborke.ru/uplcv?utm_term=esen+yay%C4%B1nlar%C4%B1+10.s%C4%B1n%C4%B1f+matematik+fasik%C3%BCl+pdf+indir PDF link annotation
    • https://emilline.dk/ckfinder/userfiles/files/gitokufunolasotekomax.pdfIn PDF document text
    • https://ijp2.com/contents//files/50839779445.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/45210314618.pdfIn PDF document text
    • http://idroter.org/userfiles/files/zekusolova.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/wuzumunetej.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/pobilorone.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb35e1f86e---sajelexule.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/nunanenutifevowuruxizinu.pdfIn PDF document text
    • http://abwva.com/uploads/files/xeguvegediji.pdfIn PDF document text
    • http://deltools.com/userfiles/file/ziganosi.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/25512164687.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/96326096550.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bacc7fb6c7b---gavukanamakubuzajavatom.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/7d893b9bcb3c1b62095b263725dd4a8a/75061816761.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fb6e1466789081568b779a7d73ca1ee0/xejeduwibaxozibaf.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/ludemetojemuneloripujili.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161087988b558b---mebozazo.pdfIn PDF document text
    • http://ebus.cn/up_file/file/belazema.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/5518586001.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/nopugubogevefulewe.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/nupumeloguzugano.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/doluwovavozokofituza.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d610d27b9f06937d83bbd02ea1cd4d60/zilevotezuronisope.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/9405131928.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/67965892531.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/bumazupenobipi.pdfIn PDF document text
    • https://ever-progress.com/upload/files/13093943975.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_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 17860 bytes
SHA-256: 5af00ab0f98392121fea820a4d5051f6a0680dc2da292073c1433e4285b28d33
font_02_sfnt_off00011d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 11208 bytes
SHA-256: f44890037a12accc5089357fe7715ade134f024d9b48baae7e46c46dc2523d10

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