Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fd7ddc3ca0851a…

MALICIOUS

PDF

65.2 KB Created: 2021-09-23 09:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89f659c26cd6d6292dead6eb660fa5ce SHA-1: 8e98010ef8baade055ca1f1d4293c508a6c770a9 SHA-256: e1fd7ddc3ca0851af23d0d1803a42be51e8c53427744055763b03631a337bbf3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct hosts with few links per host, a common tactic for SEO manipulation or distributing malicious content. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to redirect users or execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4986

Heuristics 5

  • 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
  • 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://irlanc.ru/uplcv?utm_term=android+sensors+example PDF link annotation
    • https://kimcert.net/E/file/83522698713.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/gebabulojukepukalido.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/55341263999.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/33461275400.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/pedugugasowof.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/46288499732.pdfIn PDF document text
    • http://eksternest.be/images/file/siporanukisopiki.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/xaregul.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ntj9mn4elhhkkp5jg8cngaika1/10017954479.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415623c3213---17665125625.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/fivajutilusejikowixebo.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/68202681760.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76779181416.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/53154931371.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/32373779991.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/wamujarilifusupupezavoma.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210912_3FCA283256B40792.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/xijafudomekedivosaj.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/35852530006.pdfIn PDF document text
    • http://sung1.com/upload/files/dujejogizuwumolojuzanamon.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7fc8bcc6b---54264855683.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d7999b9958d3e451944215ac332664e8/24240158830.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/92810261959.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/53697110955.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/75069256823.pdfIn PDF document text

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