Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37d1730f5e6607a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 08:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8daaab70592b3d0dd811b3c62e542afa SHA-1: 0aabf4c144e8227180370c15d92928f41c6d2af2 SHA-256: e37d1730f5e6607a00f4b724884a474c0fbc4a6bfbe85aebda2ccec52d03600b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4beb07fe38cfa349e9511e021660c380/40662451007.pdf In PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5d31c021a26d25b1826c15d0faafa760/69236520542.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/89525547314.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/75464179482.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/95488983912.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/latinitajukosevotu.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/dupanevu.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/wepekuvapakori.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a663ec4c32d55923e6e1e1eda2dd47f1/78068417242.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/zorenukajeji.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6cacb17247087784c9b9239fbb348046/gawugoruvejekebigukot.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0948053001630826316.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/40722142220.pdfIn PDF document text
    • http://premo.at/userfiles/file/27885790707.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202199203633404.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/26113383977.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/3jmubp3uh226juv44mdsr9qdo5/wetabonegidafewa.pdfIn PDF document text
    • http://freewest.at/xizexijududegibufu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe6788251a---6428938337.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/73174798437.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/nigudobinulinaxora.pdfIn PDF document text
    • http://portableandcool.com/files/files/95916326004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ghd+app+download+apkPDF 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_off0000d5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C7 17268 bytes
SHA-256: 822e74f44fcd1051d2783d5c05e10bd01c7afec0421921e00301312bc024c29d
font_01_sfnt_off00010257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 10116 bytes
SHA-256: cb70426f64c631754350b853c83621df1739e97bfa5b136dcbe9e89f34983bf6
font_02_sfnt_off000118e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1