Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ffe5959480c87a…

MALICIOUS

PDF

95.7 KB Created: 2021-08-13 02:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52b61cbd4f9ffe290ad63bf4393cafc1 SHA-1: 734882aac134729bbc20ef787ced41828b9e7be2 SHA-256: 72ffe5959480c87a46033ec8b8bc3ac8e5aab2d2aaab551baf6576591669f66e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the presence of numerous external links, including one to a potentially algorithmically generated URL, strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and heuristic firings indicate a lure to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2977

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c8411c526---60983596892.pdf In PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f49ead27---budasisuwewe.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/f0mkq2s259ltahdeutpbe9v13t/29220860342.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/21311020469.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/43826135962.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ae001c895d7---zogosalibodasa.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/45782374298.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e618f21a4---nomipiwirixepowob.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4df3eda4---zejabemuf.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/54017734995.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/14754447600.pdfIn PDF document text
    • https://digireg.ru/upload/nimijonipedelub.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bebcb6fa80---wokijovopuvem.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/luremibadesese.pdfIn PDF document text
    • http://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/bexixewezew.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608646df5da91---tivikinijejabujonatiwe.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/gelotipepi.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/senodam.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ihj2ct30mg4ij2bsrl76k8etoj/bamadivutasadeza.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/49835459469.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/27121325907.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/motunozigakigurugudegeme.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/64439942694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=object+oriented+programming+in+java+mcq+with+answers+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_off000136d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE2 17748 bytes
SHA-256: 8ac55698d34bd466c51e275c03a223f3897a98f4e4b810118b212f32875d985d