Malicious PDF — malware analysis report

Static analysis result for SHA-256 a993d5bbe86f6c72…

MALICIOUS

PDF

96.6 KB Created: 2021-08-07 18:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4425eb537927fb44f108956faef077ca SHA-1: df31e2216fe95c40999f7c794f97e64657d7fdfe SHA-256: a993d5bbe86f6c72909fca0d7a39a809bef0f076cf9389f54c8b14e09b13d7d7
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to numerous distinct hosts, many of which appear to be compromised upload directories, suggesting an attempt to obscure the final destination or leverage trusted domains. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://tlxzkj.com/uploads/file/080629472940.pdf In PDF document text
    • http://www.deopendeur.org/imgUser/file/86884169138.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ea57b37775724cc26bd145de99328338/65924574731.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be65212425d---xexoxobexafuxuweto.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/relepuzavoreda.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/nabepetelekoxukebefijil.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/vhv17hfvccg6j6m9nrs811oh9a/bopizelanularebivokonel.pdfIn PDF document text
    • http://chinazzjx.com/d/files/56068839723.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42b218628---78877221573.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/kuxosinoxefazigumoz.pdfIn PDF document text
    • https://clubon.top/uploads/files/bejumatojapatepenuk.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/wuxoriri.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/43993365639.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/25287690930.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088792ae3532---kovetovuwuwegepeziz.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/caj3rp85r26j7lb4m67go3imvb/18239341865.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f60d9e5aa8e7cd1828d634a0f35c44c4/ditap.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5d25b9f1192b36ae464246c524f32cbd/87619196277.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/xosusoga.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b00d77b95---83055191826.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/rurukuzelifatalorolesedap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=why+is+the+brush+on+dyson+not+spinningPDF 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_off000113e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E8 18380 bytes
SHA-256: 92267bd32bba3f602edbd9d214b3d01a5fb199c16c7d1e4b06e3b0bcfc455454
font_01_sfnt_off000143e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E9 10808 bytes
SHA-256: 507a5972710fe19a126764fe9c6cb37b1406b00fd9f97bdcd55f208cda490c45
font_02_sfnt_off00015c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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