Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56296222d50ed50…

MALICIOUS

PDF

86.6 KB Created: 2021-07-16 00:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 31876a00fd82234c114564024ae3adf3 SHA-1: 3718e5bd8212cd2a58bc9ec0c108edfce143889d SHA-256: e56296222d50ed50896a53734d1b69f08e51669f43bb31b42afc20b52ffbf1a2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3f9b687c8---roxipube.pdf In PDF document text
    • http://fashioneducation.ru/userfiles/file/mozawurul.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/08c7ff63a233afdb092d51af0024111e/witalegenepamubux.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/2c2c6e699b992a172be997f12bca1f6b/xepimiz.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/81482745331.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/3793502868.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/fakamumovavekoziwevufilir.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e89b009fcb7---26625314434.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b05c049d474---10848975937.pdfIn PDF document text
    • https://bczenekar.hu/files/file/gexorubu.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/woxamisabakifuvu.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/90982352961.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/90323020801.pdfIn PDF document text
    • https://ferropula.hr/files/sagavawazoz.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/la9ifuqacqlh42tqnafqm28v15/gaxopij.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/1f1b8dd39831d216a04a74bc1c904ebd/31301202584.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/bulopanine.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/36128031481.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab43785d7e---86616160861.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/tozipimefu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/251186180b6b2d0d901bf1c010cc0bfa/vedosisu.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050712313549.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/giwukonazuvokaraxebilunil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+many+shots+of+tequila+to+get+drunk+calculatorPDF 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_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 11452 bytes
SHA-256: ba864c9efc7c57cc59ee4f4d766c11aa221c29602310119de868b595268f933a
font_01_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 17236 bytes
SHA-256: 9051e48f5e13a5831861cc47285c8e29b133653fb394a3f40f8248453d473ab4
font_02_sfnt_off00013513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1