Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3ff23608bcf592…

MALICIOUS

PDF

86.9 KB Created: 2021-07-29 23:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8558b27d9b2c193113002be4fa9270a SHA-1: de68511fcf8e1db2bbe29cb4dc95b8ba50e7a495 SHA-256: 9b3ff23608bcf592ed2e3460c2c13d94fe95af1d995478f327b59322e6413a91
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecdc3d1bf5c---napaxago.pdf In PDF document text
    • http://hitecds.com/userfiles/file/75511507093.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/47cae3463890f4d218153c878a096ef6/8245597545.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/27275836183.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609256116a81d---zijisukowibotezesozevukix.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/c106c7470a52b3a9d46084323d355002/48922493887.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/98151210240.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/lumijidubiba.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/73701641879.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ba9eca1ed00f8c33a6273b00e4f7c6bb/84722088071.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/64c6793bea82315938efd17f7e2f682f/kirusobatututodamotokol.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/64831114044.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3db196de4---36655132573.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755b096fa75---47717661664.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b21ab663331---1787073760.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/61708869815.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/65000018500.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/xelufuno.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b002ee3b09---fasupatidituw.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/7633a663a1aa1597321dc8c07f9d141f/peluvevurukuw.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a83f38807c8---fivavusovamalenoni.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160884fcb1058d---doduk.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/56dl78r6421c9avroi9533h993/86552608446.pdfIn PDF document text
    • https://people11people.gr/uploads/File/15027626517.pdfIn PDF document text
    • https://zzwgjx.com/d/files/lumukebakiso.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/9639fc24271ce9d0886250c04cec6cf5/kepitoliwuguka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=acorn+180+stairlift+problemsPDF 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_off0000f217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 11144 bytes
SHA-256: 1f09ed0a76c65a3fe2e77e95e500ab5fbf4e0714acba0eb62ddda74fb378f1e0
font_01_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 16156 bytes
SHA-256: 8fdfcfbbdc6a82f4bc64f41e12a67c62d1834fb48c79247fc76fc2f21d3e12c9
font_02_sfnt_off000135e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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