Malicious PDF — malware analysis report

Static analysis result for SHA-256 9887bd8c3d134bad…

MALICIOUS

PDF

86.9 KB Created: 2021-07-18 17:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 533353b167b0ade8845c5eaa46436b7b SHA-1: cc0ee07c02ae4f7ff801eca4e392e79e507c1ab5 SHA-256: 9887bd8c3d134bad4597900ea3c774ccc167122f5e511735c1c9cd7bc04216bb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by an ML classifier and contains numerous links pointing to compromised websites. The structure suggests it functions as a link farm, likely for SEO manipulation or to redirect users to malicious content. No scripts were extracted, but the presence of external URIs and the link farm nature indicate a potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/347a0a91b778241a7e2f0196bdaef803/nivajisaxamutit.pdf In PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607095a03ba03---pisijunadejawokodu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073caadc03df---31409971411.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8854bb92cf---webopa.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/c8nnt6qjvisg0n61ims4660dnn/xurejufab.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/25316214286.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/lizofetomusuzapezimejopit.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/fijizi.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b4d4cdfa7---fezewunodonawob.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/62593799089.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/23662545118.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/xapakibitapunojuf.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/danivomimanifon.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/21ef6d91e640f8a14a8106163544aaac/77724470387.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2kpjsaa9ps869k6274d1id08r3/mavuvapirirowupidojid.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/21eald872resi88s5cntln16km/55722130788.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/luvow.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c59b87c1a57---60483625863.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2e0cc23a6---73214274768.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608102c4ecc85---dumexijogigerutipum.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/zojidowoxo.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/i3v0k03hbd4il9d70tmoa1ntk1/zimokupunat.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210717170447.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/139de3cce5788c47e706ff7be59162f9/nunaroviwimel.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/sugabixisagepuxusifefese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=poisoning+the+well+fallacy+examplesPDF 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_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 16980 bytes
SHA-256: a88596fb7a8f33fe96b95e593dabc9f81d48720b80a5cd73d7474181c5a4a498
font_01_sfnt_off00011bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001340c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340C 11132 bytes
SHA-256: 5670645d9f990e15b01d48152a94faeabb0b60b6c48e68eb6d77db3629ce5eac