Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae60ffa6edb7928…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 18:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: acc255e6c306231e5a2d993f07e2f521 SHA-1: ad6244ce14862e747d8c2df91992667bd7a19f0d SHA-256: 7ae60ffa6edb79287f0df5212fac781aeb766b047346031b979a6979dadab351
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories. The ML classifier strongly indicates maliciousness. The presence of JavaScript suggests an attempt to execute code, likely to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=all+item+shop+skins PDF link annotation
    • http://ztkammer.at/uploads/file/putafunenopenoxajoradet.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614017769ad2f---dixabebonufu.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/47198029556.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/38479889070.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/67900788620.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/38502654409.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/54982494075.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/93119738062.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/novotepok.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/72813294050.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/45e426aa3b4098ff23c9524df867e519/bozinot.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/gusowijatefixolavejef.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614289aa38f57---73755408098.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/66306580324.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/71569833752.pdfIn PDF document text
    • https://tmtteks.com/files/zivudidomire.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/wawaw.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/66207130773.pdfIn PDF document text
    • http://telektrans.hu/editor_up/lazatogalujiz.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/gubiwutaketixu.pdfIn PDF document text
    • http://status.cz/UserFiles/File/tiresajibevugetaju.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/7573652876.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/bakotazikewewofogevixemo.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/wuzudij.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_off0000d097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD097 10328 bytes
SHA-256: 9cad87ff365b07ca7ff5b834207cd4e943dc016f572255173743760f41da4ee2
font_01_sfnt_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 17472 bytes
SHA-256: e346ff1914cff25e0ddffa99ea1197518c230231587e0f2efd3ca082e7b6d31e
font_02_sfnt_off00011544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1