Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c5d7fc56cb3181…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 22:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5915c0704d1782b58cdf01add4817d7 SHA-1: da0675037e21584c983ca845b410b66087a6e7f4 SHA-256: 18c5d7fc56cb31815ec9c14e94368a3a395955b9efe6cbfbfcdb704215075eab
124 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3798

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://virtrade.gr/userfiles_lybo/file/fukusavibep.pdf In PDF document text
    • http://dentherapia.hu/files/file/14527374908.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1aad85ea---maboxoralikoxuseg.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/80023249169.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/23653058397.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/24817345418.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/53620321768.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136de0a3b87c---46491686568.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/78202276716.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/44636220100.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/21878416182.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/xapatul.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/gofunex.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/sagipuribajefazuvupeziwof.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/tadojutubelo.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/17950708303.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/46881325623.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/xagotirodorovekawas.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ecb4b4d191377dc5caa62c7a44488f04/tozik.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/92742873516.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/xekuxokekuseriwakutupumi.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/wozozuxeworasoselakezixat.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/pawaninorixidinisepawo.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/pozedivowevukoxugiwusur.pdfIn PDF document text
    • http://fabtur.ru/upload/files/47786349316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tashas+cauldron+pdfPDF 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_off0000eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 18356 bytes
SHA-256: eacaf28a4d31e22199007c058be774a79e9ef7d6ba0ba4f0ea801d4a5dcc45b7
font_01_sfnt_off00011ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC5 10456 bytes
SHA-256: f491e2e2756cac56d2794bbacc6ab5e374773aeccdadc45a688d7faf8052d0aa
font_02_sfnt_off00013270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1