Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c2eb2840d0acb4…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 05:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f8c8a346d4bc3c74c7cea58e504863a SHA-1: 32cc00af6a5eb4f7c718b3bd4cfda74fd81bbc09 SHA-256: b9c2eb2840d0acb4e79827e008f072dae10229de38880ca486fa266bc70318cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://garglob.ru/uplcv?utm_term=simple+present+tense+exercises+worksheets+pdf PDF link annotation
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/34831123e84ba4d8668369c22d5c8dff/71586214972.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/panuvoxupokebovusibu.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161425fe8d3679---38460154911.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/44373639829.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/59169794759.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/jevozapinigusefamez.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/pedatobo.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614163bc7a146---3507085723.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/jorazerizivudeloga.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/193647f99ecfc08f80d79ca49c7ea18c/71327758167.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/zapefidaponavu.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/tenoniperolazone.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/wevedegeledim.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/43678196832.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140540d35281---15054331771.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/gomun.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/maparoloxezaze.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/gigugaj.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16309107601504480337.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/xusisimisoti.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210916_050840.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/sumobimoba.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/zofimodomufer.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/kekadajimatoxig.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_off0000c323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC323 11080 bytes
SHA-256: 5c58145455b554824edf0843270c292d9621ce3e3e35ccb3afa73417ded41cb0
font_01_sfnt_off0000dcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 17320 bytes
SHA-256: dff4bd0815ae6450e79f04e7a6a5557685c4c818e15f06c1ea6c855919fda638

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