Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cde531d7580b8d4…

MALICIOUS

PDF

70.6 KB Created: 2021-07-20 00:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 65d287c46e70419e4c68539d685e1dfc SHA-1: 313787bf778aae8c7f2380e7e986f1ae6e78f241 SHA-256: 5cde531d7580b8d4ae4a4e710f079682f63109ef267d4a2211f4129d8576b78a
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which appear to be compromised CMS upload directories. The primary purpose seems to be directing users to external, potentially malicious content, rather than containing a direct exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5249

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://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/90e4fbfa5457ea8762babac2bf8a003d/49179347638.pdf In PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4ee97b4c7---nijixulorarawedaxanuda.pdfIn PDF document text
    • http://pk.mo/userfiles/file/ziwofiwilanoxididor.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/bavunadurewu.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/25825209844.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/65715022016.pdfIn PDF document text
    • http://erex.hu/upload/file/dapilotebazebewola.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7a52c602c---gafewupaliluza.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1eb4a0831---84915231182.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f217ab2aeccedea2a0365125e7efa513/disivejapisinofebi.pdfIn PDF document text
    • https://parfumzone.ro/files/file/rojiwawetoxivukarokugeni.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2lgak6eln4islflo9b7unfgm16/75384437720.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d31c20f33---51080926375.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/nalasubeb.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9cc2faa91ff458198c2fac41d61e2064/25068329194.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1c9d730a3---vakiluwem.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/busemakajevevakubedujimig.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/3c5c9ca4d3c2c637cfb973ee01b32ca5/jobijimigunalovowusugivo.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/83467225448.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e1e842787bac2866528e6ed20bf83c62/26012325956.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/57133495675.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/4cea297563dbe78e505085c72e986c2f/miguwovonuwafazitiw.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf5f46668f---peganusiluz.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/gisugevebu.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/xuwudumagabevorokuged.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/pazasas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=oxford+english+for+it+pdfPDF 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_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 3032 bytes
SHA-256: 43a9d082803b05d7353242e5c6fcb2b3a7c2b98b158bd880b1cbe05b4bda5b7c