Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc02f4a5ca62eda0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-10 04:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc66d07de55607c7c32fe9799ae89b80 SHA-1: 75852dd2801eaa240d3c4316ed147a55ab40c8c1 SHA-256: fc02f4a5ca62eda083c3cbd44e6a4cd8c7589fff6b684bab90017156064640b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://laborke.ru/uplcv?utm_term=paper+io+3+online+play PDF link annotation
    • http://varosom.hu/userfiles/files/9670153497.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/sodijoraraxapaxusifode.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/48276732482.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/kemubokeroxijenewu.pdfIn PDF document text
    • http://nenorm.com/files/files/tenuretejosatova.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/kejizib.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/nodin.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/43689903083.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/76695291234.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/42523664484.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/12205126058.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343399b9a4d---78872835805.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/21107717d0c1f8994e74720e7569f9dc/tisazefo.pdfIn PDF document text
    • http://vucert.vn/uploads/files/98011083377.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/99458543393.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/sekiruraji.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/29751266430.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/kanotonosewasozojemab.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/werawewifafamubole.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/tulezi.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210902_9A194901B924E69A.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/98b92b2c9147ec6022eccb108fbd6bed/95969358176.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/13082926617.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/49184585192.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/ximopizebes.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/89976889608.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_off0000e132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 16852 bytes
SHA-256: d8eed38d67c2444f3aa7c09dc4eec05b39ec88ecda899dc61797a1b9019d57ba
font_02_sfnt_off000124a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 10264 bytes
SHA-256: 173b6876aff12b5533815b5ae74e27cccb2cc0b39bf529e5dee40b72a87a2bac

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