Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38b66101fb4c11e…

MALICIOUS

PDF

86.8 KB Created: 2021-08-01 04:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62a3f207e48a28ba5e64860e1e93ecff SHA-1: b106a814a0ff6da3c16a7810210d7f255a12c00a SHA-256: d38b66101fb4c11e43c5892586722ee7768aad71d015e0b3c240ac5588c73ba8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm, likely directing users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://chcial.ru/uplcv?utm_term=qcm+vendredi+ou+la+vie+sauvage+reponse
    • http://e-park.es/img/uploads/files/nogokedix.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/egfrsc050ustl20tr8uc5cq755/99954963403.pdf
    • https://gretajensen.com/ckfinder/userfiles/files/nokafebe.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/1jge1ahndvt777k2qling7end4/laxegiroridujapubez.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da5809998aa---gufagikan.pdf
    • https://giga-tronics.com/userfiles/files/ledodoxifude.pdf
    • http://agro-vostok.ru/userfiles/file/ruvibadoworojunavixojep.pdf
    • http://coming-c.com/userfiles/file/xomurazedixureruno.pdf
    • http://khanaphatgroup.com/UserFiles/file/54248835447.pdf
    • https://www.paseppe.gr/ckfinder/userfiles/files/16846820369.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/25159281440.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/12610667870.pdf
    • http://sanga.asia/userData/board/file/11291633702.pdf
    • https://ms01bet.net/contents//files/zamal.pdf
    • http://erdivigado.hu/userkepek/file/40766543697.pdf
    • https://cfbadalona.net/ckdata/files/semugiba.pdf
    • http://flexicourse.cz/res/file/dazumipekamujadefitogu.pdf
    • http://botosani.ro/img/uploads/file/20776549783.pdf
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/banimimej.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160727fb2426a4---75122805729.pdf
    • https://purmoradiatoriai.lt/images/files/82769346909.pdf
    • http://ferrocom-spb.ru/userfiles/files/58648039185.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed93.bin
ba58d0f34d066e51f6fb42f78a6e7f308a958058269f08a706ed93fe36f45ab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 10984 bytes
font_01_sfnt_off000106ea.bin
1200a9daecf64e4ce644601a0776b9fbb38f6c088b4b65499e8e09e5de05c2cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 18420 bytes
font_02_sfnt_off000134d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134D1 16792 bytes

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