Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc39c6149b617c7d…

MALICIOUS

PDF

79.7 KB Created: 2021-07-27 18:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9518a2a0221044f0293ff395440f23d8 SHA-1: 086beab080265d90729fab21cd1c28ae52b767e5 SHA-256: cc39c6149b617c7dd3d628c9552b32063c53fbb019d54316f9947674ca50db65
104 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to external PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS upload storage. The presence of 'utm_term' parameters in some URLs suggests an attempt at SEO manipulation or tracking. No scripts were extracted, but the primary function appears to be directing users to external content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4210

Heuristics 5

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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
  • 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://discovercefalu.com/_data/images/file/79922900049.pdf In PDF document text
    • https://batikatravels.com/userfiles/file/potusoxezeterape.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/sebasekelike.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/muboxuvonigaba.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/8331db288c258613dca51d3abeaca324/5505666865.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/naduxasekibete.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/vufapedumoj.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/36941594291.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607863bb0de3f---nikililidinifavuw.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607168cd2b9e7---70221176815.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/fijuziwugorogevuvigugivis.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce730151ee---pilirixupalejijifedaro.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/6b4fe388af7eb7085efb77f62884b88d/96111248350.pdfIn PDF document text
    • http://renovator.cz/files/file/xezelakeminireraneduwud.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/anlhctp2s4vm7tft0g204c53eq/47596153405.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c127fb71718---rotojurorupoxovuru.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ie6sbup8vfijk2ghovms293rh0/pigijudusitinuzi.pdfIn PDF document text
    • https://eclearusa.com/images/file/pojopugidaf.pdfIn PDF document text
    • https://bauarch.bg/files/bozaxixavirazibare.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609236638db08---11298505436.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a61a2f539---47871086444.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/9cmdrjphub3n2oeb0cfch767fc/rorokonapiselasagez.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/740041008.pdfIn PDF document text
    • http://iccarrentals.com/files/file/rinojixelesibakoxinepo.pdfIn macro / runtime command snippet
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6bdafb75df12755e908d3db81e862bf/84165204419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bonding+teeth+gapPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 10408 bytes
SHA-256: 3553e0d5611db02269e8ded7f05b08d1963865a30ef3a28c6a8a17dfbda02242
font_01_sfnt_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1