Malicious PDF — malware analysis report

Static analysis result for SHA-256 52de34afedd68af5…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 09:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0a6bcf8ef954daeaf5c159b8d49a94d4 SHA-1: 104df8c5c3357f2875dce36842168e894ffe2450 SHA-256: 52de34afedd68af534fda0c6c7f71ce418a4dd936d8674c4094df76bc2619be1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=thurman+scrivner+pdf PDF link annotation
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/9091454549.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/231619242860.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/zazipiviw.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/40760065780.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161198daa9ca81---pemalipako.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/55596bcb6fc43ccac22322b93af40ed2/nefugirovifefupikewu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63c518f4b0---53423768799.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210618083158_o3ru6g.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/584791e58394ca4db639cea0164ddee0/luzap.pdfIn PDF document text
    • https://hgb.se/filer/file/33294778806.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/daguzopoterotixafi.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/jerinimogukov.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815c518fdf7---terevedigepoguxet.pdfIn PDF document text
    • http://zamgph.com/uploads/file/151755001663.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/96289440132.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/titaduboj.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021043008461184.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983fefddf66---18718408401.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6b4f3c8a7---kitimufan.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/752bb06bacf0252bb950770520ab072d/42637326064.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/geduvibe.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/ragafuxibekarepuf.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16091d9ae32799---joseforurexaluji.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/puxofalexekaruvaziguxub.pdfIn PDF document text
    • https://billdembski.com/theologyIn 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_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 10748 bytes
SHA-256: 973daee193036ee010fa495eaa2adeeaaed999849bc759e28851d74e5b84c6e6
font_02_sfnt_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 17736 bytes
SHA-256: 60dfee5f89416334f6a65e50d0ab9015804c42e04f0b0a0a6fb2019f51e4692d

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