Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c6b153677b4eb6…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 02:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 94b70a0d8c6292dbc92ed6cbeebcb72d SHA-1: 994e2bc0e83f45b197c6c3347ee7d0888c83cdd4 SHA-256: 21c6b153677b4eb607672ada46b305553260490e5bf10d9c01d56ed08d1bedff
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identifying it as a phishing trojan. The presence of multiple external URIs and link farms points towards an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://studioschicchi.eu/userfiles/files/42921045294.pdf In PDF document text
    • http://cabini.it/userfiles/files/47267325858.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/91384345808.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/90474205642.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210912233101.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/tasovanofatifuz.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/56466847610.pdfIn PDF document text
    • http://turatabor.hu/media/jarid.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed026d3897---73019819756.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210905232606177.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sepewodomanaledu.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/vedagedalisagerezokori.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/9156319075.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/14483531070.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/wupenadulonafesamu.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/13240267728.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1cd651180719d240ca9f9ad4b0760edb/lowamomi.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/0056c0.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/tukulide.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/78232891424.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/21266655313.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb33eb87b6---ladusuxoden.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/66383038513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cara+menjalankan+kali+linux+di+androidPDF 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_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 17808 bytes
SHA-256: 3180425df1118b92a11763cf6bba03ecfef3b73b34255ba8531a37a2bf86c3e0
font_01_sfnt_off00010b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 10600 bytes
SHA-256: d60e706937e00b7e82d6d11d31aac693614b5b6e2febde3eccab8ee841b1b913

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