Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa239e05c825ccee…

MALICIOUS

PDF

91.9 KB Created: 2021-09-22 09:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a88433f84d5a16b3b8254c7323d6c6f0 SHA-1: 340eebf1ca04ce9b1ea497278570dce32b4a420f SHA-256: aa239e05c825cceeedeb35cdc3d7b47b6ef82e2c38fd85bb336a3766114b2a7e
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to compromised WordPress upload storage, suggesting an attempt to trick users into downloading a secondary payload. The ML classifier strongly indicated maliciousness, and the presence of multiple links on disposable hosting further supports a malicious intent. The document body was unreadable, but the heuristics and URLs are sufficient to infer a download lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459f89482da---55949905230.pdf In PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304862eb3bd---2973762146.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/kaludivutomaratas.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/52490538736.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210916214619.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210919100040.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/ripulikaj.pdfIn PDF document text
    • http://firegallery.ru/img/upload/11522325655.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/75882723623.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/rezozewevoko.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/13120267430.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/26013969610.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/sokejenexidozarak.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/49589725016.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109062132476027.pdfIn PDF document text
    • http://104450wp19.agentcentrum.com/userfiles/files/gofetejifimisezosajur.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/vadipafuvoxujasifavadu.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/zoziduzaxakapixirugu.pdfIn PDF document text
    • https://ka-base.no/images_content/file/xuwowu.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109121524412313.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/tuluvetud.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614013f6ac0f8---54019955557.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/75146253119.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161412df9c6e33---zafuxoxilatugepuvasud.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/197fe6dcf6c82076c5bc8a9166bc6023/70231624513.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/6680817634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mxq+tv+box+firmwarePDF 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_off0000ff0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 19424 bytes
SHA-256: ddfd5e9512b059b70bc15a6c60fc11477f25b71c10de60ae2d701cb16eca13e0
font_01_sfnt_off00013168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 10592 bytes
SHA-256: 35c6193e98a65e11051240e110288fceb18efb42af1166232adfede8e4b71645
font_02_sfnt_off000149b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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