Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90f723a922fcfcb…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 19:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7e2383f7095b9e307b17444cac4ebd44 SHA-1: 014ae03b99622ee9a4946fd47bf72720b8eb8c82 SHA-256: d90f723a922fcfcbb683bca992ae3dbbf8483a2404613737add7405597d1feb9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external PDF files hosted on compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content. The presence of embedded JavaScript points to its use in executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://com123.vn/uploads/file/temejakegedawu.pdf In PDF document text
    • https://xuanhongkhang.com/upload/files/36572285010.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/45879029433.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/36729463645.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/bolitafesutovokoxusiva.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/43416824325.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/80691883206.pdfIn PDF document text
    • https://x-software.cz/data/file/11976888984.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/63981728525.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c094ab1f791---jiwuvaxudanab.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/tusefinupa.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8871c00ff---xedatite.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/45947783575.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/jobuxuvopakowevopudugila.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/72de7c014863e413e5c4449bee2b3301/sepoleji.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/guputenuxirudixezorumox.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/supedivetegapawusixajulal.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/89152928889.pdfIn PDF document text
    • http://standardamulet.com/files/files/87827271045.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b74cbccfccf---muzeribujiwizotiwutag.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/pfutsg1g9sr7b5amie6oj28230/jurumuf.pdfIn PDF document text
    • http://allier-genealogie.org/File:/28025944283.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/56807946135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=quickbooks+2017+training+manualPDF 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_off0000cd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD62 11176 bytes
SHA-256: 0ab68e0bc604d9882483fbe41f01b225f5cdf7b403b44c5740259f39431eeb41
font_01_sfnt_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 16600 bytes
SHA-256: 0f9373048f2eeb4a62807f6a183d1a4d54e8274569eb5b845d8188efd5636545
font_02_sfnt_off00011254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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