Malicious PDF — malware analysis report

Static analysis result for SHA-256 08af3d1821d171ba…

MALICIOUS

PDF

64.0 KB Created: 2021-09-04 21:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 54b4df43653f6a2065e0015e0a51d994 SHA-1: 73a91729036dac25709681d2991080e7356c7f09 SHA-256: 08af3d1821d171baf4f03bfe12971820fd99d52a587b046289b74fb95a2fb9f8
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, including those pointing to WordPress upload storage, suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9183

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://smidgel.ru/uplcv?utm_term=miele+coffee+machine+manual+cva+620 PDF link annotation
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5458253c6fdc090022d9eff1f995f589/13560884081.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc13c340a---kofadegokujuli.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/titizaterosazo.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/nofegenomujagefodavor.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160af0c5562dca---43837573660.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb5b6d6861---83402059603.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/kikarulorekeruge.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/bewamoviduginabapinino.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/58098008747.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/9831b27e265448c0b9474e773d1857e3/5174861685.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d353162cd---1474281584.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607be033171fd---68878427571.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/solukexifenunejuluzijos.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e9dd84224---63095584710.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/46078901456.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/ritawafilizoron.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/82960135519.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702599a0217---xakuf.pdfIn PDF document text
    • https://bdcomunicazione.it/file/fimewusedofeforebuter.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe26e2270e---88283402125.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/gidip.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///poxafulamem.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/28953045747.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/92800643229.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/96055433706.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_off0000dbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 10804 bytes
SHA-256: e15b70104202dde305f04d75d84573443c5bd71b8c4b7749d2b2e00fbcfa27e9