Malicious PDF — malware analysis report

Static analysis result for SHA-256 23be1fce5654787d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 22:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d229bc16efa3c400c79aca40cb8b1f6e SHA-1: 8433056170bfb1f70b1aad26f612d3ec3a8c0325 SHA-256: 23be1fce5654787d9d5765d5957b101a8154a23f7fd63fbf31ae510bc468ff97
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b838063c36---1443777226.pdf In PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16082dd9a34f27---89249772428.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/91563877412.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/13b04cdafacf7992f161032169132690/tamiwofuregazumoral.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/49427434034.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/negivojilo.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210629205323.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/95383689917.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/20247328037.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/wumemuvaralelevibek.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/bupowigefif.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1f44e9c1---jewuna.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/fadizeluwidurojokozutivep.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/4d20f3d1ae2dccaa97e76dd2fb0d175b/rajofudezukobumu.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/68753486007.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/0b7fd20077d7cafe3e54657383d250b9/42743526863.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d3075604eb47980bcc2e62bdb54b593d/merasubi.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a10e63ca2---doberitomasipomol.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/6c2552b028f2b3b4cfc5a52591ea3740/kagumogu.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/33250620145.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/mugege.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/fovujonujiduxofano.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/jilarugobejot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=7+year+old+drawing+of+a+personPDF 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_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 17284 bytes
SHA-256: bd48c24e943cbca58f14d95f4b7cfd59c27023a1a745650708bb56ce5a0ca564
font_01_sfnt_off00011420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11420 10728 bytes
SHA-256: 28fcf31f5af9fca196533fa11f6d8edbd7c2dbd7488ef8223e6c8c9ec333cbae
font_02_sfnt_off00012cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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