Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a8673910428720…

MALICIOUS

PDF

65.1 KB Created: 2021-08-15 06:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 79b9c7187d95dc4d823d7fc410e52ca7 SHA-1: fa970b461be19a62c4b980b2af3d3ca269343820 SHA-256: 23a8673910428720527e8139414d577a193db78129701354af74310dcb00bd7f
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. It contains numerous links, many of which point to compromised WordPress sites and other potentially disposable hosting, characteristic of a link farm used to distribute malware or phish for credentials. The file's structure and the nature of the URLs suggest it is intended to lure users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7110

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://akapacha.com/userfiles/file/30247521931.pdf In PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c483daa38c---94828445336.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f73472f22d0002d4519ff0bfcfb436b9/41294536742.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/fulababuwewapukaxavam.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5885a428b1bf34cdb1f59ef2260dad6b/tiluvasa.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/varafatizodubebokatizor.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084267d7d8ec---nugipukos.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e62d89d0---losigatot.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052200215732.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/56401137618.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/lepugalakukowu.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/b685d7f7e084b88c69c2c58ab33ddb79/kekanarawadonenupawamuf.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/gebigugasebusemukowel.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210730214925.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/5dt2bc1107tsjhpo8bp0te52q4/gevowatipazaritumipu.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/97310100367.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/fibojivanotamuvir.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/lalanodasubo.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/fafidegajujodag.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/14335808192.pdfIn PDF document text
    • https://gilbertems.com/videos/file/17110061314.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/bdf52dc42c0a82e5a7d86ed5ec6d94e8/66780998572.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160909d04c40e3---82167403842.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d25231ed853---kodepe.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/7073905042.pdfIn PDF document text
    • http://isgsrl.it/images/file/24774024705.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba839ee40b7---67434003657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+the+date+of+class+10+board+exam+2020PDF 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_off0000e58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1