Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a91d0f415a2ea72…

MALICIOUS

PDF

118.0 KB Created: 2021-07-19 23:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ee011f33b19cbfd9b42baf09170896f4 SHA-1: e89dfc02d78b4aad805aa43f07c932c6f96cce7e SHA-256: 8a91d0f415a2ea72896259762f86518980d05b17fce650f08f31419e974a3a45
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites hosting malicious content or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of compromised CMS upload links suggests a technique to host malicious files on seemingly legitimate but compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/53sh7f0akqsjinqjun2qv4p9ns/76851029460.pdf In PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/21569504802.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/96816088531.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/lugelotip.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081791612248---50769129188.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607074aa71d55---lekoza.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/53931880016.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa513a9053c---45091926717.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f09cab93---xafop.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/kuwazi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7ae61ba6e---498658878.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/cc79a0e7b99bf7818519b9c4ad3471e3/39073758289.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da50816d1a---zivijanevod.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/73199838190.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/959036c7f1a1edcc035f2ff56ab54814/pafifatemamexozukunofifo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f3eadb4b0---77601836818.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f935dae7a0---67836080337.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6812af9fb---xinijaragixipedovumu.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/92o2oa0pjiemtcbtqbk367hu9q/pobupajavufofu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/2b19b21e445bc19098564f7393e9e182/nezugidudex.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/soninesejaga.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607231ea98c95---duvixig.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083202498928---7515331814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=chinese+american+food+near+mePDF 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
font_00_sfnt_off00015027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16839 18628 bytes
SHA-256: 5a9b727b947ae444c9f69842093da12fa15223aee9ce3b9fc0363e1b1cdf3f1b
font_02_sfnt_off0001976c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1976C 10628 bytes
SHA-256: 89bb07c61a33ae672263a475d5f39746613e9a501f0dc827bdde3879d9cf246e
font_03_sfnt_off0001af7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF7E 8472 bytes
SHA-256: 1d5c8ad7b44732f3e01a89d6ef1d106b9b07181876a24f6a0b0944a8f574c397

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