Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b09d243bd232c5f…

MALICIOUS

PDF

70.3 KB Created: 2021-09-01 21:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 525444c2ea8fbb8572798fbfafd8685c SHA-1: 2aab0596d70843b833701a480c68221246887fc3 SHA-256: 5b09d243bd232c5f7074b510e0bf176b4b110699b2828d3421c9f55547b8e7db
64 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised CMS upload directories. These URLs are likely intended to redirect users to malicious sites for phishing or further malware delivery. The document body is heavily obfuscated and does not provide clear textual content, but the heuristic firings strongly indicate a link farm designed to exploit compromised web hosting.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3117

Heuristics 4

  • 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://huntic.ru/uplcv?utm_term=baby+name+announcement+template+free PDF link annotation
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/hk76a0u4imt540mmeehnh1ksi6/ruxejugi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7bb669afa---vitif.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/510112a03863e4086ba63c160301fe84/18662017761.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c31711079991b8669ca98c9a8eb208b4/tusaziwemenobajifemolezaf.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/378607c346877ac1649865fae02f006d/48168398988.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607687cc90a48---gewopu.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/lopixon.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/40614217412.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/54955753356.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/kunanepepepopakufatiw.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/8c17d83f08e4997c22044383cd4e6108/mizuxedomutufijub.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/niwimugefuto.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/1vi30d42slrej0ab6eoq4q8t60/25653817130.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8b676eca---7686307318.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a17bf1947---75360737002.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1540894053.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/e3s53mu43pbslte7avfh84qrdi/jorogugomugif.pdfIn PDF document text
    • https://www.jedeminute.de/wp-content/plugins/super-forms/uploads/php/files/qf94llqf5253rt5q71be2vnuhd/zobamuxezibugiwetewede.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/kabafumagufavopokomezoli.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/73588692765.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/ligoxulewavetaka.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/subemubajifaw.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/285ddf794446f440e0e76db6fad4f98c/45408824792.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56c7a9d9a1---94238016571.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e2b1ec5a5b07282db7e8fd01a4ee0a02/kazamuvilubalarenusejowe.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f2115719fa0aa50683d26a1a675f0b79/33239038014.pdfIn PDF document text
    • 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_off0000ccaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAA 10788 bytes
SHA-256: 0579a890b76a3127ace8127296b0d508c1a769e722de19c08efbfd21123dae55
font_01_sfnt_off0000e55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1