Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6b5ad431ee9b58…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 00:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93177e56648180533d13be847ddc7301 SHA-1: ebc0b85c768380824e969b6b4ee28b7766a93c06 SHA-256: 7f6b5ad431ee9b581e91e1e5557947414b807ab8ce90f60c1fc082cc5322d07c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL targets suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nidi.mk/ckfinder/userfiles/files/42245820650.pdf In PDF document text
    • http://kaiyudachem.com/filespath/files/20210822141232.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/76834161383.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/zaraliwibaruruw.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/silekokanadurepijifiketod.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/14656804394.pdfIn PDF document text
    • https://technoray-medical.com/userfiles/file/bekifovobivage.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/58311101803.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8aa263608---wejifosakiwijo.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160927c99cddf6---kutojipetolenununega.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/87793515518.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/jagimexaju.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/75496065234.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/veguvotedikosedaxisir.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768250e5b7b---47975741532.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160793363bb9d9---56518926296.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/wizotesomiluvukodana.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/wunuzurunimiroraj.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c95ec8a21b---sopotosopuso.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086436e8ec16---lemanefaxerulujawife.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/70000066082.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/15025314074.pdfIn PDF document text
    • http://atya.eu/files/file/63385435760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=normal+body+oxygen+levelPDF 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_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 17144 bytes
SHA-256: 3e294356ef536539d65dc31ec70a38def4a545e69a07da634735d0448005cb72
font_01_sfnt_off00010d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 10632 bytes
SHA-256: 7ebccad3352d98e1d2025c4234e7f8ed7f0e2f103adf4d3226477f8447b995b0

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