Malicious PDF — malware analysis report

Static analysis result for SHA-256 d349070af6bdace6…

MALICIOUS

PDF

114.1 KB Created: 2021-06-26 20:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b6d073c0f63424adc93d8438138534b4 SHA-1: 9183407353fba7767d823476a14f909f264f4d8f SHA-256: d349070af6bdace6061f67f174f4509cf89dc494025e9d8ca7ddc9966cebcde2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier strongly indicates maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised CMS upload storage. The embedded URLs are likely used to distribute further malicious content or phish for credentials. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://crysiq.ru/uplcv?utm_term=fishing+spots+with+playground+near+me PDF link annotation
    • http://bulk-supplies.com/userfiles/file/xetulanagebunagopifajolal.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a5c3d9200144ce99a33f321cc0ae7e52/gizurifu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01985139d---josujonigivosaxilalumu.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/30556949769.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1fd303de---vukedenezapuwu.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/dokawemisenapa.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/nunanenedotunoguvorep.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7a4b19ae---lulijeliburelunive.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c85eeea8cce---bomoxotakobux.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/vml2pvujip6u2p4dsp5qs66123/bonekasigokuxotaje.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/niredukesaduxota.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b325af30fa5---venim.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/95051091449.pdfIn PDF document text
    • https://motacademy.it/file/gegixakigixaj.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/wunidepilamonekusobureli.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/cabcd4427274379c89dfa55057aa83b3/32291980058.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/meverafubuwugivir.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/fb0f849ade0413c2bcc1cb594788426b/sekixulopusigowumumuj.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16095a4ddcc77f---ruridizeturigajukojuja.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160942d898dd61---zokabivojinedulegatotuwe.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/8h5t4qbp4dj96ev87iaanrskqa/11120195770.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/18060621228.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7f788d286---sexafuzibeb.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_off0001587f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587F 11116 bytes
SHA-256: 4120b4366093558a410131be39820356ae6f50a751746f6c9af103a9b863f8c3
font_01_sfnt_off00017215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A27 19168 bytes
SHA-256: 38118023d80c37c23eaa830e9ed6a680d5170ad878531395aa4cb2c917b33c58

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