Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f4941cbfee7966…

MALICIOUS

PDF

73.3 KB Created: 2021-09-11 05:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a11dede413fffdbd7cc1c91008485fd2 SHA-1: ca7405b043b988d43ce10e5bd548733a5e086d39 SHA-256: a5f4941cbfee7966dd6850917950690e0557ee4c4a03672a8c6ec6570efcf9e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://irlanc.ru/uplcv?utm_term=pogil+activities+for+ap+biology+global+climate+change+answer+key PDF link annotation
    • http://distant-property.ru/fck_editor_files/files/76797076234.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/basaxatu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613036e607488---kenuwevusibe.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/reridejujuzupurijaweno.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/25906058979.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4ccc85266---5224935342.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/simuxi.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/66675230571.pdfIn PDF document text
    • https://losungversorger.com/product/file/50254813658.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/wuxaj.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/91504478799.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/giloka.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/73566156964.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905055543732738dfxkvf.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/jirodobaturigidafilimar.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/kevapaluzadelodom.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/1902975028.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/423758147.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/sexano.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/80307953712.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff91769081---65012155578.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/tudupa.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/jeripakepomew.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202191124404740.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/8511441149.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/dasakaderinilajepakiru.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_off0000babf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABF 15628 bytes
SHA-256: efe5c53eb140ed6ca35884697899c00f40ce786e6bd59bf4daeae4af7a982c39
font_01_sfnt_off0000e266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE266 11424 bytes
SHA-256: 89e3be4285940ce1dda121da1ac3dca9203f3b848b0c26a008f743dcad23727c
font_02_sfnt_off0000fd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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