Malicious PDF — malware analysis report

Static analysis result for SHA-256 3248da054c67a3d2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 20:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bfb677066b767389f59e72f88e65bbe7 SHA-1: b197107cb1bb67f9dd57ea234be05979631f10ca SHA-256: 3248da054c67a3d280485b8de6b73e1f4732cbab7254edf594ce5431cb0f8d6e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The presence of a download button lure further supports this malicious workflow. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=gta+5+rom+for+ppsspp PDF link annotation
    • http://nscenter.cn/upload/files/lotoduxatum.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210903100122.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/21543393011.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/wawagemedo.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/jawani.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/rujipejirogut.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/35809984397.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/dijasodorumoponerabumal.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/fonarenobepenodibo.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/80085764115.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/6e16b42dcf47a14c713f2b87df1f7a68/24545253788.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/66430868811.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210908_133035.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/bowofufimosisezubimutokon.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/54962587969.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c21148d7---girikad.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/vovojigubemelatapijo.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/8503107428.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/52107760623.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/87833610436.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/jusiwun.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/47168609181.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc0f524160---gofebisume.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_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 18620 bytes
SHA-256: 2b491a5ffcc2d7b22039de93c48237f7d0334ef0ddb1fb23ebfef1a54689c953
font_01_sfnt_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 10320 bytes
SHA-256: 912f3e2eede83f36eedeb7ddbf5eedd3cbbd323a77718687bed16e1d99c97dfa
font_02_sfnt_off00011f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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