Malicious PDF — malware analysis report

Static analysis result for SHA-256 af69d5bd9650a559…

MALICIOUS

PDF

71.2 KB Created: 2021-09-12 07:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 60d23e93d3dfa0bcc24f83f64253bfe7 SHA-1: 96e8cac99f0ae6b6df783c2e8ca88bad4ba0c62c SHA-256: af69d5bd9650a559c5df802fdf656bc8113ea6b4446fe2b70c8c08a25072b536
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate the PDF acts as a link farm, directing users to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://beta.nhatthiengroup.com/files/uploaded/files/zabesazo.pdf In PDF document text
    • https://mavibusiness.it/file/53333629050.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/28895632411.pdfIn PDF document text
    • http://blccy.com/userfiles/files/51180086633.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d658f2dec5---70212905828.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be9f5bc0b5---fanozofojarefuvu.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/39276702457.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/torupisogosufejisonitakax.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/noramovaz.pdfIn PDF document text
    • http://lobi.md/userfiles/file/4324295944.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/48339825813.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/zunenerewutubumodijipax.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/19757856769.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/povogisomoziwelunedan.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/27449bcc6f2d6daed472f43ee5fdf439/84028290100.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/89613012623.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/ganidowuzanijizase.pdfIn PDF document text
    • https://epiphanych.com/images/file/55278152005.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/selipenuparijidelipa.pdfIn PDF document text
    • http://fxmeat.com/upload/file/98099d6a14847d147be8033cd965602c.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/tedazinene.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kcmrlo8gmp1uo6e1mjd3as9dt1/nunititesurimefet.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210912105101.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/logaviwaxiluloko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=music+player+with+speed+control+for+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_off0000b55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 11012 bytes
SHA-256: 8fc2ca7fc219ad655f89ddbc473a46c832275958ec8f501ae83501732977002e
font_02_sfnt_off0000e70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 15612 bytes
SHA-256: b640719f06704eadc5e7b13539f2d5481d08b0f7b86aca105f53413d420f2d65

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