Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69964c8369d7967…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 08:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be3ffc2e94463e1038e799db53a8f4fa SHA-1: 866403ec199cc4afadedafd49757bac96f5c4a61 SHA-256: d69964c8369d7967a5206022203b8942db6d471bbd4ad65592607f4b5dc9af8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded JavaScript further indicates potential malicious activity, likely to facilitate redirection or exploit vulnerabilities. ClamAV detection and ML classification strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://archism.ru/uplcv?utm_term=bus+game+2020 PDF link annotation
    • https://aynadakikemalizm.com/resimler/files/45785545002.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f41c90245d---54438401677.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/2928307773.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141391051b02---20373050111.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/4bvu513gbljscsbs910s6v504a/9741187201.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/gosobu.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/xusibogawoj.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/52772993596.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/jujelolomuvoxoxe.pdfIn PDF document text
    • http://vititanon.com/user_img/files/nopuxarilijevufivixewofa.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/xegaritawipexupureder.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/mukasimusimuvafesenejeli.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/gupove.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/bofekelo.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b50138d9bbaecd7e9e384e66bea02326/jizupulusimir.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/90339179994.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc587cef89---jejakagatiruku.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/zifewegubi.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/56491799194.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/pukedosozopurox.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/fukujepuwudagunimusekebo.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/gatejavowapogizinurow.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141c7216058b---75835194849.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/xejodiditubepigaxinojo.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/51837163766.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/46874402651.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_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 10284 bytes
SHA-256: eb86be081ca13af36c9373f9a3b4725c1ef821268c8b73f9cffd05d58f6f6756
font_01_sfnt_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 17524 bytes
SHA-256: 13ebdea4aa65007f8c73b0bce3a14b46df175d2ed9a780d68deabcf95cdda370
font_02_sfnt_off00011eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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