Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0da888dcc4f2610…

MALICIOUS

PDF

70.4 KB Created: 2021-09-16 07:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af595df82d64c63f9420be722c6357f5 SHA-1: 18706e04fa35af3fe580d9677e55542a30d3756e SHA-256: a0da888dcc4f2610e0ce7abf0b0ab93aa5d1545ba3770c1ebc2cc2add1434284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination or leverage compromised infrastructure. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://allytemp.ru/uplcv?utm_term=limbo+full+game+download+for+android PDF link annotation
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7c33d1dd584c8e892a3f39e73bf792d2/97470330108.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161331b5af1f2d---wixotaturebirajeworom.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/10234166549.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/borowofum.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0b47f767---nebopatafoxife.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/xikerunujo.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef7cf477f9---bifibuzusurop.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/9303788190.pdfIn PDF document text
    • http://hingliltd.com/userfiles/sajagiviginesikezerir.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161330ea39ad6e---18929700974.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/13388588974.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0050a229d---50918879365.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/fenate.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/55347204933.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/vibutonegakati.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/45774899225.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141c181a2508---jatewakugasaxufelutes.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/bisixitebome.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/4912405215.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/31815079879.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/57834593261.pdfIn PDF document text
    • https://tarsiman.ee/files/file/5602607895.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe1ce3d9b0---90528013031.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_off0000b59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59E 10712 bytes
SHA-256: 455f71dea61bcc16e296cb2dc2683c696b0a105ce742666262aa4f16c7b7a020
font_01_sfnt_off0000cdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF6 14976 bytes
SHA-256: b8c942b1f9d524c78a27ea92a6a8d0a0f99b98dfb5302e102d036a8926ce081a
font_02_sfnt_off0000f3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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