Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e7330ae89c96cf…

MALICIOUS

PDF

72.0 KB Created: 2021-09-16 01:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da28ee51fcd3805aec94d9de3b520259 SHA-1: c97b4aaa412c8e2bda92eb6da4e2e76eb9dd1299 SHA-256: 27e7330ae89c96cf81b6f1347c1c05a09231a5fb1ebab623092886398caf3edc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The file's structure and numerous links indicate it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=soldier+beetle+australia PDF link annotation
    • https://nasikampung.info/contents/files/51040179064.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a985a8bb7efdcd172cdf80b46b4b95b8/60970904198.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d079367f4bf62c26437c7219d46c9ef1/puzuzofiwex.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/zefuwegumimeboseju.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b38993f9d7---88187044180.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/70387237697.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/jodudal.pdfIn PDF document text
    • https://henuopack.com/d/files/635824966.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16130e73d0c1f7---bazitekizolalose.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/xexavivumomero.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210905_161942.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/digufapotimatasuwapolo.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/22943671711.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/10015986855.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/40523815522.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/50668302938.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/73201253303.pdfIn PDF document text
    • http://unibox.lv/files/text/jepuno.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/49039443590.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09fbabff3---pikojikeweporegumodusena.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130733613bad---wojezuva.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/27390843500.pdfIn PDF document text
    • https://wecareprogram.org/images/file/fukivefezuvi.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/9401317221.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_off0000b93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14C 16088 bytes
SHA-256: 352ccf77f029f6c0824e923f752cbceb9c38fd5dd98503d80de3e71f9bc6f889
font_02_sfnt_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 10452 bytes
SHA-256: 63704c5c916777be0da149d65e7202aa91f1dc614e341386617ac5fd214f065f

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