Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef791c4c24548a4b…

MALICIOUS

PDF

75.7 KB Created: 2021-09-11 20:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a33b788ee961f6f7e44d2caccc568415 SHA-1: b75fca5e0db376248957188852ee98c22290596c SHA-256: ef791c4c24548a4b8d8a5120410bc68c77dac25000ea435bd2a1987e108eb421
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple domains, some of which appear to be compromised or disposable, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the presence of PDF link farms and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.bufolari.com/public/immagini/file/15182455565.pdf In PDF document text
    • https://ibeguiristain.com/userfiles/files/zamuxizalalubofunoz.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/51040987447.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/fimut.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/kekojufinepi.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e2ec55ed0---49125531182.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/38565256624.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/3433922642.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/54759668290.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613284968183c---15527689505.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/22255416460.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/lajiruno.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/38193804738.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/fazeba.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/jopudezosarirupil.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210906_8E9BB66621953F14.pdfIn PDF document text
    • http://protezas.lt/i/File/kikerakilokirululasuteser.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/natubaxabodanu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ju9hgkas45k6dufg48b1cum1g1/76499126163.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/43155169037.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/55164003741.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/77060520851.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/14510689970.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/98170250939.pdfIn PDF document text
    • http://linza-market.ru/upload/files/80354346562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gta+vice+city+lite+apk+obbPDF 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_off0000c399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 17832 bytes
SHA-256: c2567f93372ba15ad9edb30c7ed0a00c9ccee4abdd4a0393c9f94e99e5b43c35
font_02_sfnt_off000109dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 10444 bytes
SHA-256: e0d4f2f254177ea44459f365bdcd62401eb7d288859e40ce4b87acb2d0881acd

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