Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbec8c72bb885459…

MALICIOUS

PDF

74.4 KB Created: 2021-09-05 09:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a7ec96b4b26a60dbe65c3cd743281a99 SHA-1: 2fdeaff8c2e3d2fa7147ae326c52249c398705ca SHA-256: fbec8c72bb8854594f9e47153258d1db462609855909941600fc734d6807100f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to disposable hosting, indicative of a link farm designed to redirect users to malicious sites. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://boatmonies.com/uploads/files/desuvapof.pdf In PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c965bdba3a---tiliz.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/ee292ba0103e6128e1021dd2b4588355/91962342075.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4bff4cb524d5281f680936edc7e836d8/wibobomiribexigim.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/xuvajifutuzilitobikag.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/96350116603.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/72542272415.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/limerewavogopazupinorepet.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/0dcfe22780ed0d15d5e3fc50cbb5e567/17188839414.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/1436225319.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc534f0a544---selasabivubakoturageb.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/57387488411.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/uma1c5bl2bucuc3vsq7l5hu4a1/82162947483.pdfIn PDF document text
    • http://blueyee.com/upload/file/031225499357.pdfIn PDF document text
    • https://33mobility.net/uploads/files/gesixibanukevijazisijux.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/nepozetupi.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210716_003537.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/virusisifunumikesetik.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/23680352350.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210618_075555.pdfIn PDF document text
    • http://gdgom.com/upload/file/210817215122072586zz3j4j3mh9c2.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d942c227e0---66915990056.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944b4f31628---72733820730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=klasifikasi+icdas+pdfPDF 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_off0000c3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EE 10144 bytes
SHA-256: 13aaff216a45995eca0759257d35f6f457be0260511979c59fb34ce7e330c7a8
font_01_sfnt_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 16240 bytes
SHA-256: cd685cc087cbafeca6b5c034655055efdac4784210d401413a96dd811f3a1209