Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e3dddf78f75f03…

MALICIOUS

PDF

82.2 KB Created: 2021-08-21 22:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2352c525a7c7970f968da4fea6ed9791 SHA-1: 49832f4ba7ecc16b5603a46777b79c80ce4b6b16 SHA-256: d7e3dddf78f75f03f3f00d6e0b33aff30353f07611d176884bc276aff81f67d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/16e35b3e1a5fb04d9acf3d3720d49f7b/retuxowomosoman.pdf In PDF document text
    • http://technoculture.cz/admin/upload/file/96762135401.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070abf542692---kiwukalomodofarusojume.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/18039137864.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/kupesowilawoz.pdfIn PDF document text
    • http://arablift.net/userfiles/file/saterudukosuwisukepewa.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/zojewodukidetu.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/sufotadute.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abd22c11683---meruti.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/nejubesijifufitivilaxum.pdfIn PDF document text
    • http://deltools.com/userfiles/file/wumajenapowulujonurelogo.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/wubidigatimukude.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/7csh3p03spon1sab9pv7k84oa7/xezawimidiwokulesilupov.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501172225733364.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/otf0fb5uancftlsnourc4vq35f/14076428891.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/95981029380.pdfIn PDF document text
    • http://dpengineers.info/admin/userfiles/file/beripolelejanipe.pdfIn PDF document text
    • http://poorclarescork.ie/images/tudaweratabozigazerixad.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/39549820571.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/0d3133d360ab03d06c8437511a8b1f54/32038272174.pdfIn PDF document text
    • https://vientangluc.com/upload/files/zisotolibituva.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/40118934147.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe0eca9d80---kukavexutabux.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/srnscjrqghnis1r896oj9r627f/solunetularakajovijesuxo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8adf1a6521---debusuxufudisofofezin.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/kuted.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=differences+between+us+gaap+and+ifrs+business+combinationsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000ddb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB0 11244 bytes
SHA-256: 7c20fac0f0cf97b75eca0050da3b94204c963ee985c3ec0b35db4e515c84ba9a
font_01_sfnt_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD3 16660 bytes
SHA-256: b29f10a2ab3d86eea3a1c6f78dd2abd9b6f39cba2f7afd76c8d1903ca0fe105d

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