Malicious PDF — malware analysis report

Static analysis result for SHA-256 762d553ba14a94f1…

MALICIOUS

PDF

72.2 KB Created: 2021-09-03 20:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e14d34c2d7588f50dd4b985327757d02 SHA-1: c1765db3bc51a7545f399d7915c42254170f07a9 SHA-256: 762d553ba14a94f13df898883f38fe451dce3659bbd53c49d008dc4515d9254b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=lien+waiver+pdf PDF link annotation
    • http://ampletrekking.com/userfiles/file/jukexugav.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/37bd8a1e85b4a2c0b835cfca05545d33/53128781157.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/67970499692.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/40946895893.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611fe4bd6beab---zidasukakovetuvina.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/191820bc931c3eaa491e483b1063fd53/xobolaxesep.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/13156880189.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/93192019349.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/53007614931.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/aec9dfc2e51022441031da817cc1ef1d/15502178367.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/59047494634.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/36823079195.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/vejoxeri.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501002410249308.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/rufesofovaramogidakil.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/gefarazakalinisakid.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/ralumufiragixowogi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e982772532d---7240302043.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a48b4114676---37820570420.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/3p0pk2akojbt1vkvifso3enct6/diduvubulul.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/34548742717.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/31054300701.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_off0000bb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB89 10168 bytes
SHA-256: c76c93a65627513cd7fddd209ed82a9f91b45b74ad462394d9e270acce4fb707
font_01_sfnt_off0000d264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD264 16228 bytes
SHA-256: 9d1a5313240b6e7c66b89d6e75584755832fb2640982300e802136622b7a0a3f
font_02_sfnt_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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