Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a5a89a121029e8…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 02:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 38845875d32c44c6e1e2c9df97b93ac3 SHA-1: 153bca6dde98263236f42739755c0056569961c3 SHA-256: 43a5a89a121029e8d0307496923c2d1d5384d2a8dd1072e0fa3dac61f5d3cdce
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly flagged this PDF as malicious, and several heuristics indicate it's part of a link farm hosted on potentially compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://planet-for-events.de/userfiles/file/78941071157.pdf In PDF document text
    • http://ithaca1962.com/clients/41687/File/zepugojotiw.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/67905820714.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610482f27eeb0---92957341464.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/raviwawefowefor.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f4228f7076b6e2c3118d1d5f6cbc83ae/vovevefenabebonopil.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/35019561239.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/53117793896.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/fetemupixuzoba.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/95264888593.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/43659667291.pdfIn PDF document text
    • http://odumakus.com/uploads/files/78722015663.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/a0a76039d96bbd1fdb4699563aa3869c/32057896701.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/lujurogiwudite.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16079d0ebd54cb---xobowunozopazinogagu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a951daec0---nopebexurorevena.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/zamofemomujedexofux.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/kibuwer.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/27915421640.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/df4e9p6qjiibsq9ur21ptqsok0/matamage.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608929cee11eb---79181243172.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/72589596652.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/73423757267.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/fukasupefijav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+put+words+in+a+circle+photoshopPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/dd22327229959b16a1f8da985447d4be/4852488007.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_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 17776 bytes
SHA-256: d8739c2d5a236ee7684fa125eee06ae304304e8dad726f5f40f7ff10cee7c731
font_02_sfnt_off000127fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FC 10788 bytes
SHA-256: 15ed01e80e5caf518d01053f8ee815198964e3aacfa0694008349f65ec1001f8

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