Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e00598eda9f8a17…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 18:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 71e9a6e87cbedea39445ca43a623e84c SHA-1: 2a1db1e93914978cdc1dde6d1e25648d1b668e3f SHA-256: 4e00598eda9f8a17fb8c21101abc17f160ae83d86dee5b8dc671f2dd8c0cce3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=mega+man+x3+bit+and+byte PDF link annotation
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/wifuvimasabijekupukuxojo.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/70395329367.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/duluzopodowib.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/kevemarugitowewatozunepur.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/43066447829.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/65843923692.pdfIn PDF document text
    • http://zaiger.ru/img/file/tedubegilavifikutawumivo.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/50517032439.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5b69ec413bd67fd08ffc7e4786d6a2dc/bedefurajelaxezitared.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/tinugibibakazoneturum.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/37827569315.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/tisopipazatimadazun.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/sopipufowekuso.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/85537417459.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/85144994549.pdfIn PDF document text
    • http://egitara.com/upfiles/files/31262165369.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/36421275394.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/94439098108.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/44576201361.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/38f75ba57eaca7659cfe9fd117d5719e/38312775042.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/27892066246.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/15773498887.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/89907856803.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210917212455.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142f96bd03a7---najij.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_off0000e43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 10676 bytes
SHA-256: 5d2d587b5944e6eefe1e006a470ef0ae3de3dc05edc3b64466faa63aa801e394
font_02_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 19576 bytes
SHA-256: 57def4b254c85379d079fe3167f37d543aec1d4ccfb4f5207b8f441641aae79d

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