Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df77a2499071d49…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 07:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9345ca3f0dd203401596a0196824e729 SHA-1: 292580a0a4a7f2648ed2f7f806cb9876be2eb914 SHA-256: 9df77a2499071d4912ed17fd8797b3494c0896745e12f0b3fab561fbae1d8154
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://dlzj.net/upload/files/20210714111748231503.pdf In PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a3619cf31568c3a3571ae0b77acf52a/11779985167.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/jerinef.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/47776968355.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/ximavikosokepo.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/dlc0oi1vpspvo18nms4jg5t1t4/62478429159.pdfIn PDF document text
    • https://triosms.com/userfiles/file/44098752028.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3084b3d92---71581700599.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/neribule.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3b921fdda84fa140ee19c2001a4f5e80/jemojuzulosetemevazopeka.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/edc581fcce8747afa18730ebe6409c9d/jitawonagevi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70150dcaf4---jedib.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a97d6d8e0e---zogizasogezew.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/19849770622.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/53477892594.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9bdcb9db6---gararoxetu.pdfIn PDF document text
    • https://susta.vn/userfiles/file/99192682200.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9dcf061d4---lexoxumumere.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082e24740a01---99322077621.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/45736982096.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/mimosilevifilonetegus.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/jirinut.pdfIn PDF document text
    • http://topas.lt/userfiles/file/wabukujadurubunuwof.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/26777035724.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/fefekozonisoworanewazege.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161119160ddb6d---fugixemevogovanuludexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sweet+things+you+can+say+to+your+girlfriendPDF 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_off0000dc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC96 11132 bytes
SHA-256: 1acd645da5b18c0cacdbb35372e32d788e1337614f2163d6a1ab26af401e8b60
font_01_sfnt_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 17524 bytes
SHA-256: 497071c6fd65a593fad1c64a6c8b546556ff16f2d9497c494b69488834c95b3e
font_02_sfnt_off000122c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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