Malicious PDF — malware analysis report

Static analysis result for SHA-256 13347808b34718a2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 06:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 343725a090db657a76a64273c9f73707 SHA-1: c680d4711268fe682858aea6c7fbd7768369d4cb SHA-256: 13347808b34718a2772eb31319b8cb5e73e8096735ed2c25d6cbb3444331f688
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=twin+peaks+123movies PDF link annotation
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/plfv9mvj1tdi18sgmjp01pcc24/73035126263.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/genavaxitafaga.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/jekosez.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/68357728413.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/66990042969.pdfIn PDF document text
    • http://only-svet.ru/upload/files/wimasazegetajepepoji.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/26367355545.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/kararukim.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b618bb60---17411919378.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134d06b49274---50175012489.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/guzapijebifibolijederewuf.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131757618469---vibide.pdfIn PDF document text
    • http://allier-genealogie.org/File:/88977328660.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/nefim.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/nepikuwiwosetinaguwusado.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/bavosuvusujukimu.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/81143087217.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/76aa49ae642624e8815a13fb8ada654f/79571982110.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381062d2128---gavilapanimazi.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/vewusozujodimaradunudoru.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/14462576459.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/bopujej.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/tuvetededazaxigakedal.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_off0000d7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 17180 bytes
SHA-256: 431852c9c27a09028f8a7b2dc988ebc2cd3268ea251a609ed77b3e1b28c06a90
font_01_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C81 10720 bytes
SHA-256: 996aa5537f333ccc2a7d73f5508837cdfd08690ed58636c07f074e8f736f9922

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