Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacb92c8762d7411…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 14:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a95eb38cac449df9e557519d1d069cba SHA-1: 4f2b112504b0ccfb089987078f865a45069dd8d1 SHA-256: aacb92c8762d741191782d648e9b3d44af767a5e789a9fa714bf377b16432934
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host and distribute malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • 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://evrofurnitura.by/elax-furnitura.ru/uploads/files/61458096802.pdf In PDF document text
    • http://yeongwonenc.com/userfiles/file/pixotakubesulenujetas.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130200dd4e36---xolivuwevepamotadan.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/938ce902a4da572fbc2b1817a4898523/49267620944.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcff6d38ff---virisuzo.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cc6864077f75fdd0b990f7a9c34329a3/kunagisafuxamige.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/35923319056.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/biwiwipafofawe.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161319eba7b1ff---86237424230.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/47429173267.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/nagoperoxesisiboxiluxis.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/92552065999.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/56579528462.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/dolipirokulemijirukax.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/43973757801.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/31753236689.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/xeduvapizabumenutebije.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/6466583272.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/cf6esad1kr1hng4cq441m39nkn/gezozufizeviguja.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/43393fbf8a26af3d77efe8db1bdb627e.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16132f9af959f1---50164729613.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/debifof.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/saropowoxagosana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fs+14+lucky+patcherPDF 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_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 18072 bytes
SHA-256: 0c94e39db966834848da579de1d3e7952acf891aa1f8bb7d1a6925952dd57e4c
font_02_sfnt_off00012145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 10568 bytes
SHA-256: 5f2814f6f0733ed05b9b68bf9418ed4684f6c8e05a9e57355d8ff0260623ade4

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