Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0e156eb9944e8a…

MALICIOUS

PDF

86.4 KB Created: 2021-07-17 07:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44bab8855dc07ec3238a94ce8480cf53 SHA-1: 8dc57533905390596613ce27a3dbf9b54f1a7e24 SHA-256: 4b0e156eb9944e8a048db4ae74beadc0e4d43761cf63882d0e224757fc949eb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm, directing users to numerous external websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous links to potentially compromised sites suggests an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://dlevitin.ru/fck_editor_files/files/nedobekexora.pdf In PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/musukezixigezotakumebuf.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/bekutalirujupoduzam.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/kujakujekaritov.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/sinoligowewewet.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6e8cdc7b---97629884274.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d57fc2751b---zajuxepadefoxux.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/27646885081.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/av4vpnibsv6gmqsq1hv449uu82/kokipikuravugekogazowu.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/weworiworufezexiv.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/janagepiwid.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/98679198171.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/51970225681.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/8445654492769bb0c4199a73ed7b2cda/bilagapixuwenapil.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/tb8p34r921s2tqa45vpoc7fsnu/98448786306.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/wufasatuxikodasokenopip.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/34361640302.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d2ffd6e0c---33657516015.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/kepidenigavagatiwokegiki.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094afe446775---zalimosezenugug.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57fdc1006a---68823238856.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/96202579316.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e9d4d3d83d1f254bb21181e7c3a69278/kexobu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/28320057907.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/jgiscc71umg9naopcnku5e1e5k/16567520355.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/36575778275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=nutrition+for+elderly+patientsPDF 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_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 17668 bytes
SHA-256: 8e82dd8baa20416f04c9332b4605cba1adf77c8288e517ec1ed7b925a4ae17bc
font_01_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 10680 bytes
SHA-256: 9ee34699a53e78ccee4d8840de7c4b1571378fa25a34b462a058e4099d2aaa10
font_02_sfnt_off00013436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1