Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17ba66ccb0cdbee…

MALICIOUS

PDF

105.4 KB Created: 2021-08-12 08:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e746a1a9cadf16e11be09a68e2c522f5 SHA-1: 2db6c355150b9c2c0a4420a68c44b55728fa6ea3 SHA-256: d17ba66ccb0cdbee86f68eee0ca6f77c485c8553acf6e673c3bbb094c6666012
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to domains that appear to be part of a link farm. Some of these URLs are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://ifap.it/images/file/96828938128.pdf In PDF document text
    • http://garderoba.sk/images/_file/rinobugedomidewojupe.pdfIn PDF document text
    • https://dhesient.com/media/botovifezarenagefe.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/66769195785.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c940a769e72---xitadovowufirubagunujil.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/39126712444.pdfIn PDF document text
    • http://shamayachts.com/upload/file/69876719254.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741d0b73fa5---zusoretobikomodubamos.pdfIn PDF document text
    • http://446888.top/userfiles/file/katonadigalo.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/44629835852.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd15464d4---23067237353.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210530015540.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///27284938075.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607266ead2143---73668831737.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/fidoxiturapikorusuminibo.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610c105b87c30---97576172175.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/5664653748.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/3002191358.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/trerretbfdd0egdfoj01hne03r/17824355867.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/998d6ce0f67d3e75c000de1527140305/pavusivitoxuwuz.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6c4b18620bbacf73578fd7ef755ee2b7/dikadivafatato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ati+comprehensive+predictor+2016+test+bankPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00012ee5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12EE5 17848 bytes
SHA-256: 48da427ede8c72dc4307dfff33547660bbefbc4c221874e55703b25eb19b11bc
font_00_sfnt_off0001140a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140A 11472 bytes
SHA-256: 9b1c7757f3c02ff698b4b2869fa2b459c409d02ca60b0a88d404f316d490bedd
font_02_sfnt_off00014aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA3 19544 bytes
SHA-256: d0e72ca65eb3fd98140901fe57c6abfefff2ec5b930915b8e976d918d6c023ad
font_03_sfnt_off00017e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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