Malicious PDF — malware analysis report

Static analysis result for SHA-256 267a9493d303607d…

MALICIOUS

PDF

74.9 KB Created: 2021-09-15 09:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 487a614e963a2c4cd00ffc09b5771f8d SHA-1: b4a5c088b56a65caa584902be8d0ad936a641759 SHA-256: 267a9493d303607d9f277ac3840a6cf946d90a4aef794128268d33b408e8ff64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the linked URLs. The embedded JavaScript is likely used to facilitate the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maggies-handmade.com/UserFiles/files/xopivobujomotobutoj.pdf In PDF document text
    • http://www.childofafrica.org/media/userfiles/file/zimewefiwo.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/53263669498.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/21551397426.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/10/8857693386.pdfIn PDF document text
    • http://contelex.it/userfiles/files/83918385469.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/38694092424.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/jusobaxigagefelugisagete.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5ccbb58d---kimemolaj.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/0a4cd557f181f65ef7e7e39277cd49e3/rizoza.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/kubuto.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/vaveloxoresudoveluda.pdfIn PDF document text
    • http://namngonviet.com/user-/files/59531090653.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/lolupajona.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/12712108417.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161337ea6ef7d2---29976934526.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/9ebd2ce8e5e79d8b4b84de545d375203/26244576029.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/sozarosumuguvazunu.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/sujuzopotigu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2d306ba95d746a5e57f0b19475d44482/31342732930.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/buxolulimuwejajowupo.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/47581617346.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/96399862736.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/wogexim.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/mikimurituko.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/16104230020.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/36019753847.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/66241532766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ssl+pinning+apkPDF 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_off0000c583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC583 10144 bytes
SHA-256: 75d46c7cb69a8493c1138c7e8b184b3969c83565ad6feb285d6f7cb96230a2f8
font_01_sfnt_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 16216 bytes
SHA-256: 03a4b2fc1a0561be52d9e1d9eaabcb76d163bbce4e39933f14eafff78d001e39
font_02_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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