Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b4d15f8de29dcc…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 20:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62567663cb33a012d265cd051cd34ee6 SHA-1: 29a820f677a2c99e4704cf5a7c704acb5be13c68 SHA-256: 75b4d15f8de29dcc2877034e8d1c4dd7014b82626450bcb46979afbeb0766f13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm. The embedded JavaScript likely facilitates malicious actions, such as downloading further payloads or redirecting the user. The link farm, composed of numerous URLs pointing to potentially compromised WordPress uploads and disposable hosting, suggests an attempt to obscure the final destination and evade detection, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://panteres.com/files/files/99400259262.pdf In PDF document text
    • https://marljivo.hr/UserFiles/files/vaxawetafegewi.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/jenukibawoluk.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/j1l5i816bi6jbqc1s0egof0ilr/39826674044.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/23462062024.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/84320437372.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb23c6d7b---mademuxutojapun.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/21773286617.pdfIn PDF document text
    • http://esistore.com/userfiles/file/kodewofubigugun.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/petepupowidagew.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/fefinefizukaropegenoj.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135950b8701d---97270867598.pdfIn PDF document text
    • http://poiskvod.ru/images/file/51494471770.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139175cad3e9---13762476010.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/82628523082.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/22860941046.pdfIn PDF document text
    • http://scsychem.com/upload/files/lokokezokejudaso.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/lixajirusawabijidetijuwa.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/tuputurap.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/92409693297.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/30939869265.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/pavufibotuxexesiv.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/warowamew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=can+you+use+android+charger+for+ps4+controllerPDF link annotation
    • 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_off0000d5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D5 11220 bytes
SHA-256: 275c5145f29ec2d442b41703a99deb5806f272df7d75294a3b8035d0297dc412
font_01_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 16748 bytes
SHA-256: 5f6b03ca374daf9376c02fd2e75ebfdfcbb9494a6740f519bb0f33e5f9e67cc9
font_02_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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