Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e2c27f0866c0c6…

MALICIOUS

PDF

78.7 KB Created: 2021-09-11 11:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1e27592296c00bf0661f06020b91678 SHA-1: 9f75b3a5fffd6f01419ae46fcea4041207606b35 SHA-256: 78e2c27f0866c0c6281dd1a5df783c299e86f670ec7e3cc453a862b25f882dac
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload storage. The presence of multiple external URIs and the link farm structure suggest an intent to redirect users to malicious sites, likely for phishing or to download further malware. The PDF was generated using wkhtmltopdf, a tool sometimes used to create malicious documents.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4357

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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 http://okna-kursk.ru/page_edit/_samples/userfiles/files/fuwusalimutogugiv.pdf In PDF document text
    • http://hybsch.it/upload/file/rerigivozivobepe.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7c7e0ecf---durab.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/60125158491.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091112071573499.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/fesovavigijifijopitenetu.pdfIn PDF document text
    • https://masihpt2.com/contents/files/semumigotipitazaz.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/tuxawokozagijox.pdfIn PDF document text
    • http://imoroz.by/upload/file/bepireguronamatugaj.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138a2e303f0a---durafinorekodogebosuzuv.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210904_DC442BE7464DD5EB.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/4344df077ed668ec4a96594a84e2ae46.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/xodegoroti.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/79811614883.pdfIn PDF document text
    • https://tekartltd.com/upload/files/39483749426.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/67121129532.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/limofon.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cda77116e---79012157428.pdfIn PDF document text
    • http://sbairs.com/datas/files/fajaviwe.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xelopove.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/62468112679.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/6598237582.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/24140996644.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/kedufudabatipugitizuz.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/56687982744.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/59712396592.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/lagev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=movies+about+finding+yourselfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 17720 bytes
SHA-256: 8e2b28495ee5be81fe8eb7c5b80a3c3d77b7303dd615d84b3156fc0296a4e899

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