Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7b5dcbd3d88505…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 15:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb6a9b629e6eddca20a7a6b9c727b941 SHA-1: 592c8b7330cfe27ecc6c71a6c6c41de92e12eb73 SHA-256: 5e7b5dcbd3d8850563df1532a7387b0d2df36efe2176b840bf689059671f8dea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS uploads, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/181d251e135f3e32a7f24236fd373332/82304036518.pdf In PDF document text
    • http://spad.kr/userData/ebizro_board/file/wexadixarutokudaxifi.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/55124384670.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/labujokekodogo.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/matirami.pdfIn PDF document text
    • http://poultech.net/d/files/62279292209.pdfIn PDF document text
    • http://belovosushi.ru/files/negogoto.pdfIn PDF document text
    • http://parfumland.sk/upl/kibidujozobedirezaj.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8b7d411ad166c58b36673b591a60ee0a/rogemadamazinola.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/bamoxazojuduk.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613527a4f21b6---21003636857.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210912085851.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b017488082b6aa84e6bd4a1b9d74587c/57525364643.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/12482261084.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/81498822082.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399a3a56abe---80253358126.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/tobagakodipivepunikegubar.pdfIn PDF document text
    • https://pecintajp.com/contents/files/dedidavafukom.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/43867971929.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/41170000912.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/rokuroratubokibopizama.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/g6471tfcc4a2vl8jd7n7vn28gm/42602225400.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/bubotepomefewixetekaduf.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/duvalapezulasefabanenad.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/fapiredawojasovemut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+hack+marvel+contest+of+championsPDF 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_off0000e368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE368 11128 bytes
SHA-256: dda14da1418d66afa0c9a1d19761db5ac244dd239b21298d4e9bf7f96983e6e6
font_01_sfnt_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 17960 bytes
SHA-256: 293bf80634fdc1bd5c7c0df80518d64382ef5b59943592f5eda00a4c7b1a09ad
font_02_sfnt_off00012b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1