Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb82f869c430e1d9…

MALICIOUS

PDF

76.1 KB Created: 2021-07-19 14:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bafda1115a556e95cee27d4222f94585 SHA-1: 9ee751a189fc8cc7194803ec2c083b94653d7c46 SHA-256: fb82f869c430e1d97ef145aaff69a6c10eb285e122400779b6abdf18845138f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is often used to redirect users to malicious websites or download additional payloads. The high number of external links, many pointing to compromised CMS uploads or disposable hosting, further indicates a phishing or malware distribution attempt. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/eb41f6d8899cf1180c28df972d58cad3/vanalubodopujazubes.pdf In PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607318f7584c0---31227903455.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/38328515541.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/bgrn17hage29924lonmrev841o/jokodizulu.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/9016248477.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20dcc3928e---digizopudisapa.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/48396235611.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/jevamesisobo.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/vipazolof.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///bisivugirog.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/masiselotepusujetoxox.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/tanavumu.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/figokemiminuwuwigojeve.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-2/20210502090454132497.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1ef9c7edb0---4638817483.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076b81e3efa1---30873994206.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/lonog.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/mufawajekufufoge.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc3d7a289---36459232035.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/70468925327.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/2179750343.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/39850728857.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dalas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=impossible+game+answersPDF 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_off0000c704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 16924 bytes
SHA-256: aaa8a7fbf355d99cd49bc8490125c0f6128404bbb69dca7ec332de17215ec6e2
font_02_sfnt_off00010b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 10676 bytes
SHA-256: d9e7fb6f8f54cd731f9c783816c7291d87383217903f91f2d3eec0772dd7a2c4