Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aff398d6149dd3f…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 07:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ef2e66da84042efd1253bad1adef403 SHA-1: dd0f7be0a52fc34c24a1eedaf3b30dffbc1dab57 SHA-256: 7aff398d6149dd3fe813bb53424ea6d71e16d35c6094a9861624b322d147f843
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=english+file+pre+intermediate+3rd+edition+pdf PDF link annotation
    • http://jenan.com/ckfinder/userfiles/files/wivimosutabarawutut.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/67052722164.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cce2ddbb49---duviniguvupomolumizikolud.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/butugomovafi.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/6c9b5b632a575665eb97743766849173/87859608950.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613261500535f---vavabekuwaxujugaburib.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/zitolepiniwibajevefiwo.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/56117935497.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/73886135566.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/12947828335.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/81670209507.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/31871715419.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/domivesanapumoli.pdfIn PDF document text
    • https://airbays.com/userfiles/file/56755875974.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8042ee1bc3c93a72d98aaea4fe1fc82b/beveza.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/a5do3719kg61u985tbei8r67ta/68414563244.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/vebusuvefibi.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/76201991647.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/dalavav.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109141345458359.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/kojudijufapimufawatanom.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_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 21480 bytes
SHA-256: 984d8a4593483d7fe71861cf729de1c356e531ff2782524d4829d07f13235210
font_01_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 11100 bytes
SHA-256: 3b60cc60d4d7f3300b2cacd2236cbe2076d84262a8c783d1fbfc8cd772d81496

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