Malicious PDF — malware analysis report

Static analysis result for SHA-256 d452cba589002e53…

MALICIOUS

PDF

85.5 KB Created: 2021-09-19 13:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af5d0f51a271a008f61645f7eec18a83 SHA-1: b40c92f5da66bc8053830be8096e48f14a7d8dfd SHA-256: d452cba589002e53054232818f7d5ae950a21093b48bd4a89609746d0cd49985
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the extensive use of external links points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://garglob.ru/uplcv?utm_term=big+offline+games+for+android PDF link annotation
    • http://www.physedu.in/newsite/userfiles/files/sipat.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/puwabezavojoxanuzugebuzo.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/palamovifaxabovanadamava.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/15f8e9500f450fa757fcfa9569c6c579/devilositusegudup.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/buzuxa.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/5fd74c477a7a21132eb7d3a9c2df2100/98802146540.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/27529841327.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/63236483278.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/77842386214.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/55942033176.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/64399962058.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/ginosunetoseweboli.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/watubiludone.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/43358143013.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/16470413265.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/31180751957.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/selokoderesisiluza.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/rorejikogapudaloxebevefos.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/kodabexevidap.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e68da68c0---deteji.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/suxiwilotabox.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/jolisubexopewatamatazemib.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_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 16720 bytes
SHA-256: 20113255f1858b761b85ee6d19ead0d76075f1a4e44546e1227ec098f2d7c01a
font_01_sfnt_off00011860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11860 10652 bytes
SHA-256: de48131d13a186a5aa6a448b64de693ade4cbc73bb45324ed8fa47c1db660400
font_02_sfnt_off00013080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1