Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8db7ef60a7c994c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 06:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2993ae06c9310ecaec3e19990b1eca78 SHA-1: a3e3964ad699c2f8ef25cf7e87b0e34857674a7a SHA-256: a8db7ef60a7c994ca098953d4b4f6dc4bf20c4064f649fbf32943bf0d0c637ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm pointing to external PDF files. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to one of the numerous external URLs found in the document. These URLs are hosted on various domains, some of which appear to be compromised WordPress sites, indicating a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://xn--h49al71atridzo.com/userData/board/file/11561364573.pdf In PDF document text
    • http://thienlongadv.com/upload/files/gateworobokuxuzof.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161434de62adf0---kunofutimefezuzadu.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614566625f41e---35183434572.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358638b572c---42242066500.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/xosukizegidupobuzafitone.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/92b689a1cf7aaf8c7402097456f8abf7/bomutokafobodijile.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/tefezumafesixinevarufifup.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161394363b64c8---43271542115.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/6463257286db27c7292d4bcc018f7fc5/49631076213.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///boxozovadutuj.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gazomako.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458e5b9038e---56996396975.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614149c7a9a6c---77977652794.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/susanukojutukarovu.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/47815858.pdfIn PDF document text
    • http://villkasz.hu/editor_up/tozofulowomomufepuxido.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6ccf0fece---pipawoxawu.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d812beeca---48310994859.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/kabojewejepa.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/pibuwanakamebix.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/zoletirifez.pdfIn PDF document text
    • https://kaparatt.com/images/File/farobufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+export+certain+pages+from+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b7bd03a61bec0701ffa639526cae9b94/nogiw.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_off0000b2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A7 16568 bytes
SHA-256: 83cbce713cf6827fb60aaad95b7fe6acc0cd80ffa89a75ecffa310d2764b5d54
font_01_sfnt_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 11096 bytes
SHA-256: 5f49d2ba464b04d0a63f7c5e45f427e3341fdd2d4899b1f1865abe1a24f9d7ed
font_02_sfnt_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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