Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1413e68f66168a…

MALICIOUS

PDF

61.2 KB Created: 2021-09-25 12:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 039816be454b87642ca960bf3cc318a2 SHA-1: bfe2e3c042e35ad778a2a8dcfb2ff8d7f17e18f6 SHA-256: fc1413e68f66168aed5425e5a660ead0c5daaaa18dbe01af33324da8205a1216
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting or redirecting to other malicious content. The presence of a link farm on disposable hosting and UTM parameters suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9446

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 https://irlanc.ru/uplcv?utm_term=android+youtube+video+a%C3%A7%C4%B1lm%C4%B1yor PDF link annotation
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5f9ae0d98---67285459808.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/85579256242.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/miboforotiri.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9794436470.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/94974359143.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8969947c---guxavogokazen.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/89119722360.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/madowumilovuvolawov.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/mawufifenusojilizozimemu.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/gasapopitewela.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/kijarafubifa.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161411daa0d097---71223965282.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/rumipiximibojimezapivo.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210916_A6C71E3D37B101C2.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/zekogugunakawatamoxab.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/27947041588.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/pamezukuw.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/24657331165.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/fiwawi.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/93602438808.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614225a4e2611---26394110572.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/66905487027.pdfIn PDF document text
    • 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_off0000c820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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