Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df81103c7a6cb80…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 19:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e62e0ce0b7fadc6504a27e47f3eda9ff SHA-1: f33ce9b24a1bd46ba635713b578188b2bdb0897a SHA-256: 3df81103c7a6cb8009e1236277aa7a15709165cf9a85ee9bc32d8d7730336ea0
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://drafthe.ru/uplcv?utm_term=transfer+apps+from+pc+to+android PDF link annotation
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/mavomamofarijuwomul.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a69f40cadc---7007469762.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/fomifisapalolu.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/salonotiromepujekex.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/madusatiwafatejejiwilo.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/sajekojorexiduk.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/fizim.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/47009666598.pdfIn PDF document text
    • https://mavibusiness.it/file/44713587752.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/lufexunaxese.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/24189190934.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/51119456524.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/pifulodorunu.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/nujud.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a75fb6e5047eec8de6140cefc0ef86fb/43158659578.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/fonibunakusokugutoxugi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f1f8e6ca9---dijisototuvojuvomi.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/44963125199.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/76df2a9d7326c7ca5119b23de52fe495/poxaxoraximasoduli.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/xudud.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_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 17224 bytes
SHA-256: c783b178d95acb7e8773d2675f5e1699e26919b693d1a16feb78878034c0cfcb
font_01_sfnt_off0001136f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B86 10700 bytes
SHA-256: 6d8635231dbf1bcd156323ff752025819b6216612097034ac9b4f7e05f368517

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