Malicious PDF — malware analysis report

Static analysis result for SHA-256 b988dd8c8e075c2c…

MALICIOUS

PDF

85.2 KB Created: 2021-07-07 23:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bed0256cbb8902ee06412d2cb673396 SHA-1: 16aa8c1e20b198add28c3c819d67af4a45ea8743 SHA-256: b988dd8c8e075c2c96171c56ce5e847ffb085263c478fc799d632dd6c6e90275
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • 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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609675df7f816---84788428558.pdf
    • http://kingsauto-bar.com/js/upload/files/pidugefuzos.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/luradikemopuxevobidave.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/4crrosh7emhmpe1otkict0f702/matarelonorusoj.pdf
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/2291663056.pdf
    • http://orhs89reunion.com/clients/77823/File/41185846781.pdf
    • https://prospr.fr/ckfinder/userfiles/files/91092415540.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/gezusapawuxa.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f6dd6fa46---43691421217.pdf
    • http://archerelectricsupply.com/userfiles/file/45683808590.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706615cd3a4---80953276431.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f704ac8d9f1d5be8c5f80a00dcfbc836/71447975216.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b5a1ee50e64584be6c8d66bb7471e8ec/jameguwemenonukeri.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc22c1e9d1---sisuxujavagiked.pdf
    • http://charontrade.hu/data/file/80196801795.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0892a23dda8085234d599a810e64e755/21174014517.pdf
    • http://cl-pub.com/files/files/1110120444.pdf
    • http://adamlegal.com/userfiles/file/70836586329.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16077b92eb79f2---9782386976.pdf
    • https://henklinders.nl/henklinders/upload/files/30466143425.pdf
    • http://fujavietnam.com/images/Download/44875503615.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db8af154cd9---zitigululinolugewipi.pdf
    • http://hayatteknoloji.com/webimage/file/40889147953.pdf
    • http://textingrights.com/userfiles/files/vawupajo.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a088faa61a5---vabijariwaderiziju.pdf
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/32284834730.pdf
    • http://aldara-latinoamerica.com/userfiles/file/41747698702.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hdl+bs+ldl
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede9.bin
05773e6feb8ae272b52edbe0429fb4e562f2eafbadd914c9fc986bfb75b97d95
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 17292 bytes
font_01_sfnt_off00011b1e.bin
644117b6b54e1f20ab4a7d084f81d3e87ec4b127040caed56f94cbab7ac8dced
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1E 9564 bytes
font_02_sfnt_off00012fbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBE 16792 bytes