Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d619b2ccb3795c…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 08:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e826d64a60d302898106ad7888e91753 SHA-1: febfbed90f86d62e7b3cfba634da0b31e391b540 SHA-256: b3d619b2ccb3795c2cc786e8c3f81fb46106ac6ea22480f59a9ae02e890293eb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=a+measure+of+computer+memory+1000+kilobytes PDF link annotation
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f88b1d5560---64821970676.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/vaxadufotiwetuja.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/gadagebet.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/gemikumuzogulo.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355154304bb---61277083686.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/vaxitegoku.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/de3bffb3ce80e252e91fc0f2fb39917a/rebenaj.pdfIn PDF document text
    • https://ntc-container.com/upload/files/lusapinikekepanesojufuvir.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210924_205237.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109090930053242.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/32284445789.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/99604287274.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f07ca6c612191214500ea9416cfaca3d/suxejudade.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/zewizuzejirakolew.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/77107331929.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109090732299360.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3m23r03k77kp7f7uuf0q39bq73/fatiwapipagufavowo.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/gadibsq48daqh5ctasqeu8qrmk/35596138239.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16137812d56432---58122560756.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/nekig.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/sexilaliwazoraw.pdfIn PDF document text
    • http://webs123.com/userfiles/file/buzuseliwazazovakulo.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/78726227084.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_off0000b267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7E 11136 bytes
SHA-256: 6cffb696bf3559740a68d1404ed508e9254bab81f6a5423a040d692d5476ad7d
font_02_sfnt_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 15588 bytes
SHA-256: a979f054b38c08b1076e30cb0d3c472caafc790f5a882c65fae4906f6a447fb2

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