Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b31b5d82841f11…

MALICIOUS

PDF

84.8 KB Created: 2021-09-21 11:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7213aed292802a6e58f96307345c286a SHA-1: 4b56541d0f5b4999beec42ecb9681cbebdb4f728 SHA-256: f1b31b5d82841f11b9abcc8cabdbdcc3385c9159eda58e0743d8efa018edcbc7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, including a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=does+android+have+find+my+phone PDF link annotation
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f651b161---36301463335.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/zosirefagu.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/xilijibuliweje.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/wemapusejipatavibexe.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/wulekadunixuvur.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/88617318613.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/linurinobazopel.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/tokobit.pdfIn PDF document text
    • https://comfort8889.com/upload/files/97427163442.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/9393118318.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/11472869185.pdfIn PDF document text
    • http://teifsepahan.com/files/file/zavewaroguxuma.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/67784120319.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/rojafad.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/55886780117.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376689a16e4---tototaviwomab.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/jedanejuvanegunapuraze.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1dd411f8f54057409e5860055fafb154/72589995488.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/56c7343ab204812463a8c36134ba13ee/zomege.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/28811893322.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/41319957179.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/62504552724.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/mizisikotulefuzujabujimom.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/wafesaro.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_off0000e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 17620 bytes
SHA-256: bf17851398034e1067f4e162a58f6d4a10602166a318d414c8210c8e5e87b6f5
font_01_sfnt_off0001151a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151A 10800 bytes
SHA-256: 296cd4b71b4cfb7d885294b50529c509c04d745f44377c94640d1a733d1ccef7
font_02_sfnt_off00012dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1