Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d9d0a7d4ab024f…

MALICIOUS

PDF

86.5 KB Created: 2021-08-12 07:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee4d975496947bada8337f96b3e8df24 SHA-1: 3a4574f1bf1850c8bd9ae793bd05fc7ec88b0899 SHA-256: 98d9d0a7d4ab024fd0492b59b61a7409b9ed54da1b7726e2ab01fa92635c89a8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL patterns and heuristic firings are sufficient to assess the attack pattern.

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 https://laborke.ru/uplcv?utm_term=charles+chesnutt+the+goophered+grapevine+pdf PDF link annotation
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160736bf8a9932---repojowiladidifidosazir.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c351f9d9c2---43541228365.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/poxipojat.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/gipiposewow.pdfIn PDF document text
    • https://wecareprogram.org/images/file/rekujologuxuvovenazi.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/1931aaf154dfcf2c890b9f028184ad93/fudulurik.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/53238194585.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb328216e2b---44552033883.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0d384ee53---45223743842.pdfIn PDF document text
    • https://anakmeong.com/contents//files/22542391612.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/39c3666c88f4a2806a8d133db8ef1624/30948032218.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/90194110277.pdfIn PDF document text
    • https://landi-bg.com/images/file/xojopi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10335d78d---97301190556.pdfIn PDF document text
    • http://uhli-janmaria.cz/userfiles/file/tipokasiwosafagozewa.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/5654dc1e25468a22f9310129c2cb94d8/86542812463.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/zuruvulagevi.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/farazimokebironemuvibit.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/gupaviroxelelawo.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/vibepelej.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070665ae72e6---pijumageka.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/76225397563.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4707b14a---94964021318.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/f0d0f846fd416fb3269c4d6e3caf3b94/dukabijax.pdfIn PDF document text
    • 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_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 11096 bytes
SHA-256: 69c7b1ec4931bcd879458b92aec0213dc2bee5a91290c9946cdb4df590820da1
font_01_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 16408 bytes
SHA-256: eacb589f22c4f7c63dbb67ffb10d0c979f693d9480caca84bcbaccb0208f49d3
font_02_sfnt_off00013275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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