Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fe098849f1c72d…

MALICIOUS

PDF

75.3 KB Created: 2021-09-07 04:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b99ce026ae91e24fc89eeca93ac81a4 SHA-1: 4a55bb0bdaec7c6828a52b4ce284b4af4fe9d37d SHA-256: c2fe098849f1c72dac878733e354238c3c717338dd2526dae90d7ca5c7ff185e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads. No scripts were extracted, but the structure and URL findings point to a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://neurooperations.com/ckfinder/userfiles/files/pavokibopibozisidoseb.pdf In PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/lewanigiburoside.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/5punvl80tt5pq0ersn7tusd384/13173205867.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021062822525673499.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e66a16b97b---25901416854.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/jabuluviko.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/65885942024.pdfIn PDF document text
    • http://fitviewer.biz/files/file/98147414253.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/86d83e954058fa7088e8b3acaadd4e71/11886810128.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/56729642351.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/47294e2c5793298406a213f55c2c1172/totapitotesakitaw.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/79823390568.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/35212960362.pdfIn PDF document text
    • https://digireg.se/upload/30639267524.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bdb56b63e---50242328576.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4a22acbf4---18631875572.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/65034844888.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/lefabusenegiwubimuruj.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/29197465677.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/eqrkjdtthrr6ojnfu5igjs8k65/68002979320.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/94649532929.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/55678789476.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=biology+pdf+notes+for+sscPDF 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_off0000c286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC286 17260 bytes
SHA-256: 2e610656d5cb9fb0a3dfef01901492a0cd4ce49a65e8a3b53fff8cf4a45a0b9e
font_01_sfnt_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 10800 bytes
SHA-256: 6e391d6700b06c8fd6430c6ecfedebd6a51e3a0c65c7c24c272fd56359e18055
font_02_sfnt_off0001081c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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