Malicious PDF — malware analysis report

Static analysis result for SHA-256 3993dd4d149040a6…

MALICIOUS

PDF

102.0 KB Created: 2021-09-03 05:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 68d6d45b6005a6e1b09f9bba60a5fd57 SHA-1: 9433dc14b9b5de1eed4df420e990082e940d42e9 SHA-256: 3993dd4d149040a64d8228f2b66514fe184947535ced344df7a99a7f105085f7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier also flagged this PDF as malicious with high confidence. The presence of numerous links suggests an attempt to direct users to potentially malicious websites, likely for phishing or SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://tubemakingmachine.com/uploadfile/files/77416126944.pdf In PDF document text
    • http://studiomanzetti.it/userfiles/files/kowupasuwazowazepamifix.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/125815645.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/19617393423.pdfIn PDF document text
    • http://royalgroup.at/tmp/69620184159.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607828d85c713---giwobemopatonewaboterig.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/nogezamefekomovovotof.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210727_8177A88AF3E9A764.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/19707192754.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/87775224978.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/5e8ebd8ed04eef891e40ecfecdbe4b64/sajubameforirama.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/xurilogegimerudow.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8d077377dee66408c3a49b581cf16761/78301666856.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/bifozedilajow.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210701_0A66B46ED7F8C6BD.pdfIn PDF document text
    • http://pk.mo/userfiles/file/faral.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf163d7c90---zoponowajotiri.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784e44a7519---jubejesi.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/65206646505.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/84268258430.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/36878126952.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160852bbb77f97---42762212943.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5824b1343ac0f79667a8c0b8e41f7188/goxixotem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=clat+llm+2012+question+paper+pdfPDF 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_off0001255b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6D 19680 bytes
SHA-256: d2b36f25fa2d8a7b7140a47ef8f2caf51faa28e36c6396fb66cbf64c7b0819ea
font_02_sfnt_off00016fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FE2 11228 bytes
SHA-256: 4637b2a001f732109055b3e161441bdde249b7a962507fb01b6f63f3a55d6201