Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d604a835f27e8f…

MALICIOUS

PDF

70.3 KB Created: 2021-09-07 13:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f993f4603926cf6e3c9c798fd3e33430 SHA-1: fab7653f2f2572e551e814dc3a324981f829a709 SHA-256: 20d604a835f27e8feddf33f0d3e1f93fa2070579b0c93778496f5443f6b25626
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.2381

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 http://alliusie.com/userfiles/file/50826430792.pdf In PDF document text
    • http://theclubburger.com/uploads/files/vewuwijemuw.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/genisavet.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/87606164482.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a46ed99901f---21734224043.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/8875508e288b51843815cdfe878e5949/silufegab.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161140c5aa2df0---77100139072.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210610_065914.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b477ef332bd---ravilanonoj.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/53219582846.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/ledefopiralifemoseki.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/71818622753.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/92927668393.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/66640622186.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a261cdd6f80---93370140427.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/rusuradulamegew.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/85027334705.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/37527800259.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7c72b27f2---nawerumutawajerekotog.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/78531938359.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/t2qqd06ueqa7koguf29o5jjmk7/11001186386.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cf8abe6f3---jigijixirasukefepimireju.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/59976567940.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a0e62a3bcce8b0c42e88fbc23c304681/71435029312.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/14935465397.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/83355138587.pdfIn PDF document text
    • http://belloverde.net/emailer/file/xiputilofaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=patterns+of+evolution+and+selection+worksheet+answer+keyPDF 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_off0000cf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 11032 bytes
SHA-256: 32a2a63b488d70b4e7d4791c000d4824fe1e5fec879de08f72492fb760169577