Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f0362c52eac242…

MALICIOUS

PDF

83.5 KB Created: 2021-06-25 13:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83fc166f53787ad9bc83d2496c227892 SHA-1: 5bf934ace9622c255ea87d1a6e8479137a00823c SHA-256: a3f0362c52eac242161c092442dd465b2fb05099354cfbdfbd6eddbd2affcb3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://coretry.ru/uplcv?utm_term=neet+previous+10+year+question+paper+pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc35fcb0b0---puwuwusajaranunimaduvuz.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9bdn7eune7sjhmkedjg3hliq6o/98886419623.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c922d1a315e---kegujaxoder.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/2b5260e62333a264c357e47d4dd25758/7219600649.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ad511f813c4---29056998465.pdf
    • https://asset-books.com/userfiles/file/xodojumo.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091be9ecbebb---31396381752.pdf
    • https://tkquiz.com/userfiles/file/75751777206.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/3617160454.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c756cc51a3---75484588577.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af8fca4133---23888154703.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098924934f03---96244904648.pdf
    • http://www.kilincsweb.hu/fileok/file/ziwuvumoselegobisoxirej.pdf
    • http://kbchina.de/upload/93911324171.pdf
    • http://staresecurity.com/userfiles/file/rokixunevajakofixijivus.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609be6e1cecde---guxutaweluzun.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca973920a9---rebarizorukafiwoduzapap.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c4.bin
a02377e06deede2c3351a52a5bcb232e2279efb0d3b87024003e1ceb5b600f66
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 11024 bytes
font_01_sfnt_off0000fb6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 16792 bytes
font_02_sfnt_off0001137d.bin
2c5bcbd543e67b8f14ec7f1d4bc48409d44d1c869e28aeef524e358d7de7438d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1137D 17440 bytes