Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aca091c7993bc9b…

MALICIOUS

PDF

82.0 KB Created: 2021-10-05 10:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: df3f83444638b49fd2ecfbfbec4f916e SHA-1: 19d0c9576359823197b10de27bb54c77b58d173a SHA-256: 6aca091c7993bc9b1557dfa55d950d2698dd796cca55738283bc183f4adc5b4f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'password-protected archive lure' heuristic indicates the document is likely part of a multi-stage attack, where the user is instructed to open a password-protected file, a common method to evade security scanning. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=remove+pages+from+pdf+acrobat PDF link annotation
    • https://malabarmail.com/ckfinder/userfiles/files/6525991212.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/dopifazipunuvop.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/volaloziziwiw.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/16379806746.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161315da2c5cdf---79806912642.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/24832680951.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/vugax.pdfIn PDF document text
    • http://timebymtm.com/upload/files/vosukidekus.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/60840473742.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/380d85bbbc46c1917b0890bc9bea52ab/jezamisawivawexo.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/tikakorarapewopodagal.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6f9768dfadd849aadde9c9a695ef5e40/guvomov.pdfIn PDF document text
    • http://kag.fr/userfiles/file/66093960054.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/wezidimitewugaretil.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/3664597965.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/gunobevolotasiwex.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/26146741367.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/42229354685.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140360cbfeeb---39382881535.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/bebiliripemaravikudidilu.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/gezas.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/togobeximu.pdfIn PDF document text
    • https://themalc.org/files/file/17213067938.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/pidunutusifobijipo.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/fenapa.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_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 19056 bytes
SHA-256: 7495cab2e5ed3d9ab9f0107007565d33b8b5dafdfeb0710289e82c9ebca78a31
font_01_sfnt_off0001092c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12143 10972 bytes
SHA-256: a0ad1565c31e0de6827d0aca9c8a56cbb4beeb6980833d44f62847f5ebd9c5c2

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