Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ae8e4393108f54…

MALICIOUS

PDF

79.3 KB Created: 2021-08-03 09:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cee142e5882fb68cb2acbb008aaef2db SHA-1: f4a5a65ab475e3ae408f748c7a50e21b67e3f654 SHA-256: 53ae8e4393108f54fa1c2dada5dc1587bc4bdfb73b8d653406101173acb066f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of multiple external URIs and link farm heuristics indicates a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://synerhu.ru/uplcv?utm_term=libro+de+logistica+y+cadena+de+suministro+pdf+gratis PDF link annotation
    • https://decoveinvestment.com/userfiles/file/vawazekopaloviger.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/r94jesaabfrlbr36n0hn3ucmbh/14284224634.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/takaloresewolubiwidep.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/bapipazikadedorasiz.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/pjqrb8vsmuq146od8kkn679r1i/zosugowawidesuvazirun.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/57523114586.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/nuwagixilaxegerisogaxapes.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/83100068316.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/99708487097.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/66716638779.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210624_0B290CEC01EA0553.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d96bf96b5d2c4f88dea35ea358ee890c/pafafumawakozumatalivivis.pdfIn PDF document text
    • https://ubranni.com/uploader/files/tiwezib.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/xobekutetopoxavorigojudir.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/938a1d45rqjrfpv3aahhgionf7/woludixezirunupawewoj.pdfIn PDF document text
    • https://gannat-ltd.com/userfiles/file/lakagatupejimalamunuzi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11eedb34f2---rilaxepolulowikedowe.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/natupuj.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/jagobeganuregumox.pdfIn PDF document text
    • https://buka.ru/sadm_files/35401169629.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/88224201384.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b9482700f---binuvegejagusanedozu.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/pesurulimatebax.pdfIn PDF document text
    • http://recviem.ru/img/upload/jatonodanipobot.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_off0000cfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB7 16920 bytes
SHA-256: acbc5e75e713c86182e68d54623cb4d9ec8a0dc5734af2cbcd7ec737dcc50ddd
font_01_sfnt_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 11272 bytes
SHA-256: 3af14cf662ad9ac8560047d38dca76434ee48365e6ad8917b220f2e962acea21

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