Malicious PDF — malware analysis report

Static analysis result for SHA-256 21341797f0ff73ba…

MALICIOUS

PDF

94.6 KB Created: 2021-10-09 10:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ee34ac8d765f50bbb2a273d78bfdd63d SHA-1: bf9f83d651d638a15dc5798843f9419e413105d9 SHA-256: 21341797f0ff73ba5f74b8202eeccd427d0a86032a35a1b0dcd4f52206e64efc
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external sites, including those hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious or phishing sites. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://americasbestwingsbeltsville.com/uploads/files/juwolar.pdf In PDF document text
    • https://galerieportelouise.be/userfiles/files/17146318860.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b931d78ef---nefubetofeki.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/99281631545.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/57566000260.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/munodakakasosak.pdfIn PDF document text
    • https://kede.org/userfiles/file/64184492587.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/nexuwemevuwegonu.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161347700d68b2---75271470266.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202110070435214784.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/beb2c9b490230094d3ed6c46c56cba08/zititebawobames.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/mozibodatup.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4c95d8beded3eb03e0c9ae536774c4ae/faletudadab.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/sinuwuvuzurisajutisaludaz.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/85044269111.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/totarofumagotixekabuxugef.pdfIn PDF document text
    • http://santeh.md/img/files/37465852455.pdfIn PDF document text
    • http://insk.ru/img/userfiles/file/66502407134.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/vovenepakifaviwiz.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0272127b---piguxutewoduwotiwurarodo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161556c36f11ad---82662962860.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2995110dfbf983eb1250f600b9fb993b/47899426728.pdfIn PDF document text
    • http://savemaxint.com/files/file/labobenuwuribosaku.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/mulowigogemuden.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=everyday+use+by+alice+walker+symbolismPDF 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_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E6 10908 bytes
SHA-256: eee678fbd3a71787830d66a44fec0b968d8a3ed8e7bae0787e758f5fb0636c80
font_02_sfnt_off00013a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A31 19924 bytes
SHA-256: fdb4e400b11cc488b5a8508cf64e4469e223222177276f324c9b1a7d953a1fad

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