Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92cc0f35bbb6137…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 09:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06058a6e330f9ff91861d3681ce16e27 SHA-1: 025243439bb79a1e48711e436065fd400a6122d3 SHA-256: f92cc0f35bbb61377992a19cce3609219dbce9b194f3b252f0801a6d9d20ccfa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. It also features a link farm pointing to various external domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://censcakmu.org/board/file/files/35811343512.pdf In PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f66adb3a0e78c6a2375e8c75e13d61d3/verazobixabonejawizizugol.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc819b16e7---97994405284.pdfIn PDF document text
    • http://tencanpowder.com/d/files/kuwixemigilivefofasikaf.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/88002598637.pdfIn PDF document text
    • http://a-xian-coat.com/uploads//files/202108030850512487.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/fuluwegabobivoxolusago.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/rurekusuriso.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/80217355981.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/13589fb658fdffa67e768b0619bd8a13/kabilisuxawejemisegil.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/14951973908.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/pogodububajonab.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/dokukuzir.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/rifuxedokuvejizefubimedo.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/31930261427.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/99ac12414b5fef8ecd21c5e861918026/56811964192.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/zutufanufuvutapaji.pdfIn PDF document text
    • http://tfforming.ru/d/files/2341135920.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/22563871170.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/rasotob.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e12cceef85---vorinerujo.pdfIn PDF document text
    • http://anm-av.de/uploads/files/559465196.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/46818474871.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/g6c6jr019v8geot3drkie567m5/16013986242.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607996db2a483---34097304753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=inca+garcilaso+dela+vega+comentarios+reales+pdfPDF 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_off0000d96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 10980 bytes
SHA-256: 5fa42e53750bf933587a443d2bb9ce3ff4c3bad8deb80e2d66196091c5391b14
font_01_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 19056 bytes
SHA-256: 61fcffc6ff68531fb4ac1d7e615e1b75067ddb9cba26bdb52597e1d67de40b1f

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