Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e426979566ef4e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 20:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0dd687d16cf7c1c7ad12b0303c8f1ec3 SHA-1: 40914654ddba8058d8956e883f1db57cab632355 SHA-256: d2e426979566ef4ea1984ae713c183899f25930e6a07313d23271c9a81b73f1d
164 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating embedded JavaScript and a link farm pointing to compromised or disposable hosting. The embedded JavaScript likely facilitates the redirection to malicious URLs, which are numerous and varied, suggesting an attempt to distribute malware or conduct phishing. The document's structure and numerous external links indicate a deliberate effort to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=battlefield+para+android PDF link annotation
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/k86t7fh4f5e81l3fbee24np9he/78048903029.pdfIn PDF document text
    • https://tele-video.ru/upload/files/62604547483.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/90400453533.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/83738286847.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/wujekazuvekupirunudota.pdfIn PDF document text
    • https://ekransamara.ru/files/xubosejepa.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/20997231860.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/kuxukutojenovadipovugaku.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109231757592833.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/aa1i3f619nf077ruoq28ppfh96/12832927257.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/luguropivevuxipumiba.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/69037871332.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/xedemizo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3bb29b2d7---67406164241.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/49437165784.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/45062441369.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/86469484770.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/fupuxekenusimiwilumuzepud.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109091054499477.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/57753716762.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/56578981834.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/55774870001.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_off0000b004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB004 15644 bytes
SHA-256: fbe3cd86b299578c55ab4f34de82a52be711f258b1233bc1e80741bdde99e55b
font_01_sfnt_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 10376 bytes
SHA-256: f08471504534b6d3036c60b15558dbd69d24746a3ff8ff055ed1a34888c3a5b8
font_02_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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