Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40b68f5b4e13083…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 03:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d15b6a18237108ae50ce47bf2dac51a8 SHA-1: 1353e68acac7b4d174f4db4c01d913841d3f526a SHA-256: b40b68f5b4e1308374a1ffc622a7fd1dcc5388739ab04e00d0680d1fb0dbce49
164 Risk Score

Malware Insights

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

This PDF sample was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains embedded JavaScript and a significant number of external URIs, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm to direct users to malicious content. The presence of embedded JavaScript points to potential exploitation or redirection capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kar360.com/resimler/files/82096880572.pdf In PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/21812366685.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/2e040d0a57fc9c6fe1969eba071e5061/65685350341.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/69247071406.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/kikepukijekebe.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb4e04aa45---zelugodojoxepaxegano.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160795d7f6da11---gatitedupufegewepogudo.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/87j94e9ku389ok8g96l6jmtjm4/40228156690.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161297f611a22c---ginabutukijagilepegapul.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/90191648198.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099f32a6daf7---kuvabuvijikavexupivoja.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/rinakonejonas.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7613d5ef60---babuzeb.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/tokimopobajodil.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/87959639535.pdfIn PDF document text
    • http://poorclarescork.ie/images/46800290936.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b003513f12---29738594987.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/57226820788.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be2ea8156---31480515555.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/40977088507.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lesizabamikamuv.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/26020455982.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/firerojitisupepol.pdfIn PDF document text
    • http://balalajka.nu/media/sivolode.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dda8ead7d---59087424401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=changing+pdf+to+black+and+whitePDF 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_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 17656 bytes
SHA-256: c7edafe1e6215cec24cbc8883426a7c530decbf46050071a85ac3ff5ddab95b6
font_02_sfnt_off00012e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E91 10980 bytes
SHA-256: 6ee623c8ca737d514fde33d799da079ae71f144d00516105a60f9edd4e2b3385

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