Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c999020f834901…

MALICIOUS

PDF

93.1 KB Created: 2021-06-25 21:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52ef0a5c4bcd107c5f047eb856189a7e SHA-1: 4c93a74bad732620e0f438d6626b40c278d947a4 SHA-256: 29c999020f834901954a1a276ecb414230737f27925f863af912b94fd330f441
96 Risk Score

Malware Insights

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

The PDF document contains a large number of links pointing to various websites, many of which appear to be compromised WordPress installations or hosted on disposable domains. This behavior is consistent with a link farm designed to distribute malicious content or conduct phishing attacks. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://crewmak.ru/uplcv?utm_term=how+to+make+a+museum+exhibit
    • https://ekransamara.ru/files/zexemabamoferaxatizanukep.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aad5d1c2a---45751855480.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bf5138f3165a1b260ee5383d5a441d6a/26374683516.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160769cbf764b6---67403950021.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/01c01bc51361c1cd22a57010d97c65d7/77878083449.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/lebodirovojopa.pdf
    • http://sxcec.org/userfiles/file/jezakoruxi.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3c36154b321e802e16bb0cd2c8908199/72949492414.pdf
    • https://geneticapanama.com/userfiles/file/liwelojejajobil.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/69377f1d7ef1e1526adf3903e7a31ed7/36151664299.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ca1180b290ceb3d8a2a0dc5a50ec23b9/movebekugusejiniwufaduku.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c928d032436a2a514d52550455186185/rapuvajagubidevigelepevo.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c857d6088cb---62796320525.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/49e34b5c38prr995g03qafth73/45728194949.pdf
    • http://ekolojikweb.net/upld/userfiles/file/79410946965.pdf
    • http://csc-020.com/userfiles/file/20210612182512_41dwdg.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/84664795630.pdf
    • http://apexibd.com/uploads/fck_uploads/file/79008974597.pdf
    • http://ahlhy.com/uploads/file/072353441463.pdf
    • https://shop-ecobati.com/medias/upload/files/gisijububipivikowolasolu.pdf
    • https://gulyaskantin.hu/uploads/frontend/files/83206296004.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/4cenln3gnne77vjkp6m9bqhbcm/34623883486.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d4f81f85e---wojagux.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c501d0f56f---13920608516.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608011761b9ee---xozotutesuxabonije.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc9870060917c0b072dc23d2651fc1da/65477268725.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a0b.bin
3d37109f1d6b3e126251bd3f36b05f6f30903ded476c8f6af74daf923d24da87
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0B 17128 bytes
font_01_sfnt_off000136ba.bin
d992ce25b6caff98297779fb222bff53c1b97295e7bcc75cccba669d590bed40
pdf-font-stream PDF embedded font (sfnt) at offset 0x136BA 10636 bytes
font_02_sfnt_off00014f26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F26 16792 bytes