Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf00baa20d0bdac…

MALICIOUS

PDF

84.4 KB Created: 2021-08-20 22:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 195713815cf0c6b6daf3b48e9c5c2e66 SHA-1: d165f8d056bd7513746e39d7878a00899fc691cf SHA-256: ecf00baa20d0bdac793acddc72e4ac251001e7c0abd8a531636decae491f0bf7
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, pointing to various compromised websites and disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://drafthe.ru/uplcv?utm_term=why+are+my+freeview+channels+not+working PDF link annotation
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3c40a07bc---bateluzoj.pdfIn PDF document text
    • http://sam-global.info/files/file/87412424302.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/21293117766.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/xutofivovitufi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f06117f04---jumepok.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b3b9dfcfcd8f4a19d7a452015593bb94/93118117101.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/84093128541.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160dce23341797---63791067484.pdfPDF link annotation
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7f11df607---minevekasivuduxeker.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/pt0foaoj0dargfnj14evnda527/votesomepetetuviz.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/65d4c06518678d386b23dc08d8b4dc77/33275502683.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/jogonomutitofedilu.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160798b2a68b69---28404032529.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/2020414859.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/dosezewufe.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/81622876244.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/xamekidanijapusujenobuz.pdfIn PDF document text
    • http://www.centralperdana.com/file/mibuvoburavoxinumudogefus.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/48umofo5m92lnnf2jeqmtoahvj/wobatasidinizaremopipom.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/73timbj01ejfdc0vba9qr7qka2/30037108081.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/bufupe.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/gidibirofero.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/muvasivirugofejisazop.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_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 11132 bytes
SHA-256: d0dc89548b5e75ee3c5f617060f5571b20917141eb80bb0b6ef7b2317dbc4eed
font_01_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 16532 bytes
SHA-256: 8e8b02be394b3b0f4f4c5ae00e00a8431e8c0f3a6ab62c4c40da630b18bad076
font_02_sfnt_off00012aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1