Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3b829d255f8d72…

MALICIOUS

PDF

86.3 KB Created: 2021-08-28 12:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd39aead803ac622f1f1e634a160897a SHA-1: 41cf11f9c2afaf7cfd9450b9ca7623cf3825f400 SHA-256: 5f3b829d255f8d723623caaa7c4af184e5db8667cbf38bd5ce6cb8334c1747c4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites and other disposable hosting domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and the nature of the link farm point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://hy-concrete.ru/d/files/25789877226.pdf In PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16118caa47be59---30399010237.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/rivugepegomeku.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/ponuxemitumogonujow.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/50329159687.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/81943562899.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/gategafokisusat.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2854213f1b---tozuregesobe.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/83ef86027750d8630c18f609c96d5425/wamin.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/gomopupakib.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/7733924947.pdfIn PDF document text
    • http://www.celso.org/download/dobaxonuwev.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///85879317335.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/16688436512.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/sogowanefoxij.pdfIn PDF document text
    • http://storemisr.com/uploads/files/bixepa.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/bukaxofidukemigifope.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/51987cf46288b838ea39507e03990e12/judezugolovafurul.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/8990201009.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/patufexine.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b29f4d3e5f44911c90ad282be6b19290/wuxixe.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/5657b365a42078a648df1d67080d392d/95808642513.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/83471645140.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/lomijuteb.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/46262222600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=gas+emboli+may+occur+because+aPDF 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_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 10580 bytes
SHA-256: 80323b5e9671dee8ab01569206ed02c19c75a1fb310eb21803e1e00c08e79fb2
font_01_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 17816 bytes
SHA-256: 9a64dafbeeb5d527cc63dfc4a18ffae498c2abe697e3016162d78a826dbed36c
font_02_sfnt_off00013355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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