Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cd3b3cef16f268…

MALICIOUS

PDF

77.6 KB Created: 2021-06-28 19:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: bab64dcd6220afc37a63bf1c93527214 SHA-1: 6685c18d1edf2f7b6b8651e44f483866f1c224d8 SHA-256: a8cd3b3cef16f268e0fdec568fbbd5d74257a44412f7e193500b52fdd346b101
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely designed to redirect users to malicious or phishing content, indicating a phishing or credential harvesting attack pattern. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0a539242---diviwiniwomasudafow.pdf In PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608e9944ce70f---madefozotikajimepu.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/6206966948.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a519c559e---90475325047.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0e241f68---71020067603.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2976c6babc---nolepipuxeragopalix.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/naxakovisiwebila.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/bikedik.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/2f8da1b893448bf10e6c51f456d3a81f/60690276806.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d08bc09ecd77edd53eb3e711a95deb11/nevoxesurenelumowalef.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/bb3010c6cc0f5980202614fb81bbc732/zitalumemugeremakirarede.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e623b5e8c---6805314520.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/fujetoxesetis.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/flebke3ic9sfv5ed1vf18sdtc4/40810400568.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965f2229217---385731293.pdfIn PDF document text
    • http://sns.hu/_user/file/jijusivebasexedogomibuvi.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/74643100450.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c9dbd068d98fa9843fe48d01b73dc5f0/44935509254.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/50726728930.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tojowipe.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6fe07f1d---66031489783.pdfIn PDF document text
    • http://hrudolf.com/userfiles/82831305373.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/75756633145.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093c8bfb6cc5---43139433409.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b2a17ab93---wavubewowerejexuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dirty+mind+quiz+questions+and+answersPDF 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_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DB 10872 bytes
SHA-256: bc16b224b48de4b2c4fadeea9c50a8e5a1b6bd6c2673f4590fe6af60135ff465