Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d640d8cf71a6a30…

MALICIOUS

PDF

83.7 KB Created: 2021-08-12 16:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 77b8f92037dce176408d5876022f0b4a SHA-1: ffe3f1ca1a7c1cf9d8eabac25fa677285840428d SHA-256: 8d640d8cf71a6a30f6ec96fa469bab281b10daaf0f8d223c3004dbdee3def9ae
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or employs social engineering. The file functions as a link farm, containing numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://infrive.ru/uplcv?utm_term=adjective+noun+agreement+spanish+worksheet PDF link annotation
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/1llau10cqnchlvpggnbfo359cv/32412851223.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/77fbbc1dff138a871bd2c588c3d4d768/39336830831.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/25262950113.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/zepenunovuvafipevixazej.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/a7o5e195hu06uufecdfo2mk39i/20697383395.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/wofoguw.pdfIn PDF document text
    • https://morabia.fi/images/file/9390733317.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/f9kfm5ej6vemq8tes0erap3kms/tomilojo.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1ccbfd14---bovakegudanilum.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5949630f7---697072025.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607db7a2b6ab8---fimon.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4e3dde236---matefibamuxugot.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa2n2h9dton9m3okrr13h61kqu/88317601968.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/zoxupovamotawegitenek.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ac18168b1543e40cc165bad43a4430d3/vipuwaf.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/rakupogotivurexotim.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/a01a22ec9fdd7f792935799483042533/70698747674.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/fetadasax.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2522f0077b---73454032075.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/81241031999.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/65988851512.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/2033168649.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ad4ecb56b---zigiri.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/31710808543.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/394e59hl68lvuh32p6p8rsahtj/99004447770.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/k0n91o9mmk984i648flmk0mcr0/87018731376.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef6619905a---fususojititixemudisivuna.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_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 17784 bytes
SHA-256: 3d35d592358e73d2f8a69cbaaa3773a31ad4055cf1f7809bb1407c9222f643a3
font_01_sfnt_off00010e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12624 11372 bytes
SHA-256: 858b0af0084c7162929908d27034ac94440a0ca4ae3696f703de6d6f1415fcb6

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