Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aab52df6b2ddfac…

MALICIOUS

PDF

70.3 KB Created: 2021-09-16 15:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a24058030dd5289d9a49659901db43b1 SHA-1: 6308549561287ef06a8480fffe29b8399004db7f SHA-256: 4aab52df6b2ddfac20abb9c122dfd54d99505206eeb1865142281a1107a2475e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings strongly suggest malicious intent through the use of link farms and compromised hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613262aa55297---52641774660.pdf In PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ce323b31b9afdff7beb449bbb144c470/13889183929.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/deperovega.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/92781466782.pdfIn PDF document text
    • http://agilesolutions.in/uploads/pokavezanome.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///21934545339.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210902_8_55_58.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133244130927---74976478498.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/fafuvuz.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/duxolivixifuzelobibi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210902204343481.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/dce259b5795ca17f94820ab349cbb355/83979646764.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c162666e7f---15184376654.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/66030410999.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/93950669712.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/vegazimofilutodoxa.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/xoxofinitewisijovulekap.pdfIn PDF document text
    • https://hoavily.com/uploads/files/31681183353.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/xevorozupaxekefuwipex.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/42911528890.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/22968389807.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3e0c28bc8d476652995a0990df667e6a/xutozegovukazitit.pdfIn PDF document text
    • http://topstec.com/d/files/jofoninariwuzukevelowedev.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613019b3382c4---2685046150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=transfer+chrome+bookmarks+to+safariPDF 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_off0000b4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CE 10748 bytes
SHA-256: 6cb24619b652cfe3e494c859539c7f1660626fb9fccd67cba8cb1a6ecf527333
font_01_sfnt_off0000cd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56D 15420 bytes
SHA-256: afcd54e22660e29d553aa0fc0a42978b418a4cdc06ef8c5fc1770b439230d498

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