Malicious PDF — malware analysis report

Static analysis result for SHA-256 93fbd4d18872b448…

MALICIOUS

PDF

79.8 KB Created: 2021-09-22 12:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dffe72f96f0a59a4fa536522352d3d96 SHA-1: f0b1ec74c9878db2047341d341bf2527b93026f8 SHA-256: 93fbd4d18872b448eb3b8b192c967cf131a7c0cd8f25bb8778cae0c789e85818
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hani-bee.com/userfiles/files/8573245523.pdf In PDF document text
    • http://dragonspond.com/uploads/files/45806058391.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/69201443858.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4dbd97027---malitifom.pdfIn PDF document text
    • http://esistore.be/userfiles/file/13106350538.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/28528b5324205411fcf8c98cb75a7695/sasif.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/30952204054.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/80654825487.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/vadasobulujefizofito.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/22970104710.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/xezanofuvuguzujarigelik.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/11d0d8324f100c79be0c63690990ac1f/muwefegizus.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161492788ad2af---zuwubipotufobamepimimag.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/nexuwavaloxali.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/92015538967.pdfIn PDF document text
    • https://projetovm.com/uploads/files/18911827337.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/17607474915.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614215619c23a---71724389124.pdfIn PDF document text
    • http://precisao.net/files/files/gekusazizit.pdfIn PDF document text
    • http://artepcb.com/upload/files/4471825953.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/doset.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/boverorigumitimiwizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+update+cherry+mobile+flare+s8PDF 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_off0000d0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C7 11420 bytes
SHA-256: 8c966edb7459b26d0816c88ef7caa928c74323f3028197f7756bcd18734decf3
font_01_sfnt_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 17696 bytes
SHA-256: 8b267e8be2a1867f01fb904d2ac1e79d66de830205794504a30ac87bd823f127
font_02_sfnt_off000119cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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