Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e19badf6d55fa7a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-03 05:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: b8a5e0e9f7aea149bbbfb7e62883a6f5 SHA-1: ba0f40f32dac49bab6e95ef9e5ae531cffdfaab8 SHA-256: 6e19badf6d55fa7ac6341f5a45ebd79f2879b5cf7a91cab6cad24db397ec31fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=crash+course+us+government+and+politics+worksheet PDF link annotation
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/eac6f61456c3f25782327812f25eaf45/fuxasimokanukodubotaku.pdfIn PDF document text
    • http://simonide.org/userfiles/file/wepogufirarizuraxadum.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/fazexelis.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849b1b55763---38115015641.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202107231748513575.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/nuvaloruzox.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/8b37695ea683b68c811b6be1a2550966/71156346052.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/45932723510.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/gixanagivevifalusajatenu.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/bigogulezezixotiletinera.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3244ca002---35312369581.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/18919515086.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160888631f1b9d---88877799.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/75934725784.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/98195443258.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c42727c81---rutalexi.pdfIn PDF document text
    • http://labonscafe.com/userfiles/rosixavavixuzasedewaxim.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/reliwubi.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/jawije.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/59678111307.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f7747d5e0---90078313798.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/38771009525.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/69826438811.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021081702373073499.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/geriverufidovusa.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_off0000c8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DF 17216 bytes
SHA-256: e8a802d9aabb5460836bb75268511e1627fd49903e01a5319c7391d0aa3126cf
font_01_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 11336 bytes
SHA-256: 0ccc1b815457dd5c6d89adb42a81c6de69dded2dc203c600f8419983153dbaf9
font_02_sfnt_off00010fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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