Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbb394101ca56bc…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 08:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f64e17f21d7d2b7fd5e1c0652fd6fc6 SHA-1: 899d12971b8a7012ed4b567b832f65b4b4e59321 SHA-256: fbbb394101ca56bce5cfab5df8a7aac888841f6b1b73e8df8ce5911786140935
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also includes numerous links, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript and the nature of the external links indicate an attempt to redirect the user to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c71206db57---5397418206.pdf In PDF document text
    • https://nenanhduong.vn/Upload/files/41317918047.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/0f2070dbdb5ef7b2fe650ecde1688e05/78848005110.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/97593102003.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/sofinudibez.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/17109286117.pdfIn PDF document text
    • http://maihome.hu/admin1/file/polewudobobitefamodagul.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725a45a4bbe---64038779007.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a69f9d12bd---tukijunep.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/tezetajamuruwuzipofomul.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/92200702502.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/goxisiberawuliwa.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/dosewifibexapudabakuwa.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e64db449ad---56830682327.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/39307758600.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/32334965359.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/27d1a7cdccee315750ed24085dbec210/pomikuvewem.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16086f5aef29f5---27279745428.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/95545877191.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/modiwowopikesiwifosigor.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/74994717992.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e4e5238f06ba953a611f916232ba6201/30856626338.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/fijiragavepafagotex.pdfIn PDF document text
    • http://wwsm-us.com/files/file/70667636821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ice+man+arcade+game+manualPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/rumelanazigomoxerat.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_off0000cd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD73 10284 bytes
SHA-256: c275b155b30f253cdd92c9bd44f8e5d1f577a6dc2b730003c40d870938ffff96
font_01_sfnt_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 17328 bytes
SHA-256: 26815333d9b6c7a65728e243176aae72f1f4c30fb0929e7ab8f4a0243d8c1602
font_02_sfnt_off0001114f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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