Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ccdca454b5ea8fb…

MALICIOUS

PDF

62.3 KB Created: 2021-09-17 04:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee4e14a5d36294859ef2296917483717 SHA-1: 87b284fcd4ff7be9645dcf75e32bd55f46d9800b SHA-256: 5ccdca454b5ea8fb05b5c2b2f9ef3cda9b29617c5eb5b70b5af104447b65bb70
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially compromised or disposable domains, suggesting it functions as a link farm to lure users to malicious sites. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6128

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://posetili.ru/userfiles/file/jukerojaputolijaderoxiwa.pdf In PDF document text
    • http://dydlhx.com/upfiles/file///muludif.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/siwatolupawifukaniwire.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/vusobar.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/subukonoluzoberokisusu.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/vulugamuxu.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/jafejorem.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/sidefuwofuvujojarus.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/71411132391.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614160b68b16b---fadavoladunipujubitugifur.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/19758701408.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/78414007994.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1010b1dfb---finozifulilofikabewizi.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/tonofenikijaw.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/89506987325.pdfIn PDF document text
    • http://abworder.com/uploads/files/65640673080.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/53261454678.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/lb094ghbl9d29cge3r9d7l4nf9/fodikafunorudokutonet.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/18147760401.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319027912e3---jarorofofuranapumazoxalid.pdfIn PDF document text
    • https://rotitelor.com/contents/files/xerivomediniduj.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8b5c78eb2---92231982255.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9ee234ae---febogofowofikuli.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161386b8a8be9a---35973542913.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/tovip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=wiggle+remix+song+downloadPDF 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_off0000c99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99F 10676 bytes
SHA-256: 6626951d0419d7d0a04b25289a636e1856b595e1a273ab02107f83388917586a
font_01_sfnt_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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