Malicious PDF — malware analysis report

Static analysis result for SHA-256 8386d9702d5ea79a…

MALICIOUS

PDF

78.8 KB Created: 2021-09-09 11:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3773140a0354dc124db804f3ab67c74f SHA-1: bc760eee2e84a4d43cea4146c181dda72bc19a6d SHA-256: 8386d9702d5ea79abbecaf153f6c21ca5acf0f2c31e734617d9a682141f3785e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or phish for credentials.

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 http://aokisuper.com/ckfinder/userfiles/files/zoranowokuni.pdf In PDF document text
    • http://clairerolo.com/userfiles/file/mudinaxulubavur.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/86631504172.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/9c0ecb8468bc97778d40a524c8d4fb69/40315660187.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///govipewizovi.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9dccf413---ruviwatujebip.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/96430305542.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/nejisunazexeridozosiva.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/85686745027.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/janatepoxipobuzutemuda.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2c36ac100e395c69ea0f15cdf46a09b7/19258942716.pdfIn PDF document text
    • http://zzquansu.cn/d/files/78200333749.pdfIn PDF document text
    • https://interconformity.ro/images/file/10704906651.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/bipezoxoxujulusedinapuduf.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/wotuninetepo.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/9kput5776h3an5j6smvi4hs2v3/wawem.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/8908702403.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/27497395046.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/dipabavogujugebetibuwove.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/28308862674.pdfIn PDF document text
    • https://kokomanis.com/contents/files/83433134475.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/konomoronepoxadakedekono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+recover+cut+photos+from+android+phonePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2c259bf6770099d64e46733ba19b26b8/marefefulopekurometod.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_off0000ce92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE92 17380 bytes
SHA-256: c45226a0779c45be689ba47eb011f2b4e1ead95c074629f76b07abdde67ac1bd
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001135e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 11084 bytes
SHA-256: 474a40f4d41ae485f9ef870f3e41c847c717dd59fd7b7a34f707abd5824b13b1

Open this report in the interactive analyzer, or submit your own file for analysis.