Malicious PDF — malware analysis report

Static analysis result for SHA-256 763d69e79327b4c3…

MALICIOUS

PDF

74.7 KB Created: 2021-09-18 09:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25d2a44753c96866c01b2ec70f603d11 SHA-1: a8d808ad70b676bd9896233cdb8dcb902d506e5d SHA-256: 763d69e79327b4c385917f4f8ce187d61f00199c1f02923d3bb48404dd85af3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be directing users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=drive+ahead+mod+apk+unlimited+money PDF link annotation
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0c1bc1a524cebb564aa0b128adcd3357/33381409539.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/visinavo.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/50331167475.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/83728497270.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a696a075e---jorezob.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/niluvebedinipoxo.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/tazixawatilodubasurazavuv.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/74334227413.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0888941001631054307.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/nusubazoruzub.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/koguzovoniwosakatuxodesu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139653311695---ratefiwukuwudim.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/ratalovuzaxanun.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/fotujojigezupilumub.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/25248217105.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/gutoreferogozuvobo.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/fadura.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/lajijavegasiw.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/56703262676.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/11900354883.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8024c8fa88bf338bc8ec2505d8f0fcdd/35688130827.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/womulesozirawixepelod.pdfIn PDF document text
    • http://rrarental.org/upload/file/fosukebemetufadarugi.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_off0000c250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 16308 bytes
SHA-256: 5abfb5a917e29f2b7e5de89a0d820318fd02293ce2e009a20a34204ead514ed4
font_02_sfnt_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 10860 bytes
SHA-256: 90abb1580f8e5a105b83b93c0871ac3f65c4b925fd044a65b607aabf47fd27a7

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