Malicious PDF — malware analysis report

Static analysis result for SHA-256 c589fa4b939583df…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 19:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32b5058c09b209ea2d1d0959c50229e1 SHA-1: 8b807fbd90c87bf69ffd3cfe6ac94aab6ffacf32 SHA-256: c589fa4b939583df1008399978ded5fec66c0b4a3b15f73a066e018a5249d2e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the PDF acts as a link farm, with many URLs pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bakoca.hu/files/file/69109881770.pdf In PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/vumewifanij.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac29669788c---51918792789.pdfIn PDF document text
    • http://jainfarms.com/uploads/tekopokuxiko.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779ca352ea0---38086318924.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/30665545704.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161261f61b152f---tesovox.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/gujugape.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/kodugum.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/21496390488.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/180756a7781e7ab45d8db06aafa5d9d9/19306964665.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/35335180518.pdfIn PDF document text
    • http://haai.org/upload/file/xuzuz.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b5e40663c---kuridiwolilipila.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/tujujepururezimodedeme.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/sabevepipuravorije.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609600a0911e5---repaveg.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc7731471---44567154940.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/xutodusake.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/pakojojugizagum.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/pilibawupazij.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb071a8d5c8---19366634757.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/demibibazewonojalero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=date+of+birth+data+type+in+sqlPDF 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_off0000e23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23B 10996 bytes
SHA-256: 1235a852405289c90e27b23855d17c99d28988e753b0546484785139cd944d14
font_01_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 17992 bytes
SHA-256: 81e994963de80cdc750f76dfccc827322f72d83bbdc25ffb0d9a5d1081771023