Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f9ee904806df48…

MALICIOUS

PDF

74.8 KB Created: 2021-08-01 04:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 94fd2378b11373785d1a8ee61eb37a78 SHA-1: bfe778e62940b59c8b597bcd977f35970dd070d0 SHA-256: 66f9ee904806df48c91294c76bb926354e0852bc7b9d53e9e35554f542f0883d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://inwebjor.ru/uplcv?utm_term=sharechat+chat+app+ing+in+telugu+video+songs PDF link annotation
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086918fc33c5---kolajubizomifepereriduka.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0f8fe64c0---kutatifedipo.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/porufigezatomekuge.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e85c8450908---88681128201.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0e8qikotlc4o3e0cbbvimphql7/judelogatef.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/wukosolodepawogogazu.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/f75b7a8b0264cadea6f72ab9b2d2eb47/90737556762.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/3rlv91rb7f012lnf5qlvoqicri/7443773241.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a114fb98d3d---zelekajatipakonekusu.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/tucpbrk7t9dlputrp77lkm1vse/mifabodajeludu.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d03f0825559---fibogeladinamim.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/ludokolo.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/nadipudopumeresife.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab7a953ac5---55798561584.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f33472bd1---94962211774.pdfIn PDF document text
    • http://kbchina.de/upload/fudewulexupobolubixom.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/gifawumunigolonafunanataw.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad46e7c4abf---noluwunori.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/79736435543.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/99193469047.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/15932211696.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/6c983b5c718278ca7c6441e49cc6963e/81682514368.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_off0000bfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 16736 bytes
SHA-256: 92c7cadfcd73e5ae02a2427cc040d1ead491a2c684f8b9620d4af5c98dfaa39b
font_02_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 11032 bytes
SHA-256: c6f9c25eb95f423b92b1f6f97015707d0d36ef661cd02969e5d135d8052a0d04

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