Malicious PDF — malware analysis report

Static analysis result for SHA-256 c511561089df3858…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 01:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 12f27847f488baf926a9fd402f1b070c SHA-1: 33237857c882138ecd7bdad8014b6d491b082188 SHA-256: c511561089df38583ed2062efc88aa738034ed39a224db8a34f78fd0cc8eea82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The PDF structure and embedded URLs indicate an attempt to redirect users, likely for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://cnc-soustruzeni.cz/files/file/pozubirurujaletuf.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cec56015170---18526141924.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/94632324974.pdfIn PDF document text
    • http://kd-council.com/upfile/files/kijekasokatezamit.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/sopozida.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/pejoguzedidaso.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1c2daa2abb64e5454d633d011e21194c/41569636987.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/43739796897.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/10597460199.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fc90eb8c5---dufawiratoveloragabuwuzi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612480b68d30b---xolademedazo.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/210818162807710767098mrthyevcj.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/23839585975.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1fd068cc5---40969094158.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/63663897631.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/lepapuwolilo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1a271f883---3101658863.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c408921bc2---15641348641.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944a41ecce5---55464707849.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/94432361760.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/juvafebusagewuse.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/83910934450.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c152ec22b---gatasejapotifebenim.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a62d10b440---60004084768.pdfIn PDF document text
    • http://sadrainsurance.com/UploadedFiles/New/file/3719840604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+science+of+happiness+at+work+pdfPDF 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_off0000cf67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF67 10812 bytes
SHA-256: 2bd5064c0286b0062c00371a00f26c7a9356ea62f153de7d40ff45d402ac2a19
font_01_sfnt_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 17588 bytes
SHA-256: d5c67541c837e01422257a22e3fc540acebf9482fc5efb77ad5f74884ecc76f3
font_02_sfnt_off00011597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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