Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4df8b7a7f082883…

MALICIOUS

PDF

87.3 KB Created: 2021-09-10 01:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7ea62f1736811820b3bf1590979eb0c SHA-1: bba97312315170e22752114806631bfbe9e0bf6d SHA-256: e4df8b7a7f082883b02ed82487b3972415448371fc543fa923e3a4e9fa2c164b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it is intended to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

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://pixomot.ru/uplcv?utm_term=android+ethernet+configuration PDF link annotation
    • http://suspensionestg.mx/userfiles/file/73638983632.pdfIn PDF document text
    • https://domilot.com/uploader/files/gilolof.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/70973888635.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210901_5B0BB4A60C741B60.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/mafek.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/foxoroxabufi.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/43401360960.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b4f706efb5cb83e357e73ebe3ba18897/27375899970.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/sekumolelogojokon.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/xizifonanaputov.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/47543843128.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137486e152b1---kanejoxawiwenupuxufiborab.pdfIn PDF document text
    • http://goref.ru/files/file/jibefiko.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/xonobevinimo.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/95521049708.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/libelaga.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/71468158985.pdfIn PDF document text
    • http://chemicalengineers.ie/images/87669334969.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/jomogamomirumevo.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161359eb15152d---tegolajegefevogaxuwawifek.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/8323179976.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/51494044162.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/pimisogujikezujikapaze.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/55961795468.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/wosirujatebofekura.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/p59n2c5anbbed2adjui8fbh627/86659427120.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 17868 bytes
SHA-256: 00b5586a9e23c037d453e7b5ee60d7b23ddc5aa8305b98e8d4e5b964f965d2d3
font_01_sfnt_off0001158c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158C 10624 bytes
SHA-256: 83f48f6834a405751a9449837264c909066f98dd4548a03bd9cf227eadaf971b
font_02_sfnt_off00012d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8F 1904 bytes
SHA-256: 9b096cf3accfa5f70734e2c167ea1be43443bdf79297ffcfb609dbee170b9701
font_03_sfnt_off00013674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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