Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bb3eca81c40b8d…

MALICIOUS

PDF

80.0 KB Created: 2021-08-21 17:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0d9138d7e12af50875e5a269e470e699 SHA-1: df5e6e69e4e7b4e4ecdea55221d4bc0aa61fc77a SHA-256: 73bb3eca81c40b8de7d9ff85ed4f6b345ca1d39a16fc39939c03c985101abb5c
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were extracted, the structure and embedded links indicate a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2594

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 http://csc0512.com/userfiles/file/20210628175639_3se9jo.pdf In PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ea13157e7---bajuvorozetutefowa.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/wikexojoda.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/59721521834.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/360321c37f5dc1fb1f0f124dfd50321c/86357706949.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/zinadapujuvawikan.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608724da486a8---fufedaveforotog.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fcd450bc1---19643566911.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/52594710218.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/6a8273d93e4eadadea335558913c4a7e/mufigekigeled.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/dusem.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/1399934325.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb908b85df---25621088886.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d57ab31533---68822573991.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/rekefobux.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c4a91860109e37cc96b01b0927a64024/gogopokijozafabebeked.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609037f4989c3---wobinomiwulisawevotesir.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/bosug.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b314854dc5---sorozil.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092f83a2bee7---98396389810.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16079723d1c46d---96373587645.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/kovelidora.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/94281438959.pdfIn PDF document text
    • http://goldmustang.ru/files/files/49031485930.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/rovato.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/puronifotosikoxapevoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=marzocchi+bomber+888+rcv+2007PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 17144 bytes
SHA-256: 2437aaf30d6c0a7acf060cda6aadb738938aa85dcb84370608193b961fdea841
font_01_sfnt_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 10840 bytes
SHA-256: 70d138bfcea4f8598a8cc6711016e8989b499ea729b90dbc6f6d88a9bafdd625
font_02_sfnt_off000129dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1