Malicious PDF — malware analysis report

Static analysis result for SHA-256 1445913d59345321…

MALICIOUS

PDF

69.0 KB Created: 2021-09-20 00:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2657e90f70f831dd8e874c074271715a SHA-1: 50e2c91eac85f424986af5c8dbca0f0673f8012a SHA-256: 1445913d593453211cb7e2e79f730670c6436eefd40c818dc83344592451931b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also exhibits characteristics of a phishing lure, including a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded JavaScript likely facilitates the execution of malicious actions or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=subway+surfers+game+hack+download PDF link annotation
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/8d051d8c32585ee5cc1e5c35077a9a04/92440552397.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1064087fd---2274894477.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/5987595288d4bba37c55246c73cfb386/87737956058.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/wabepobifumutivituxile.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/54696511975.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/83841113383.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/81417647142.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/342e175fa774c3604f5c54d8914ac11c/26232484601.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614109ecba4d9---gezalebevoxidipuzix.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/42632278834.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614080f8de068---pupizotiw.pdfIn PDF document text
    • https://lasanisports.com/files/98390811608.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/14cba76c49c134bac133183f26814498/jewesolelop.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/21684349781.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/lumijulewowu.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/669254659.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/12198762328.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/pewokiwofedetatajo.pdfIn PDF document text
    • https://domilot.com/uploader/files/fodijefilogenijasoretiwoz.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/29370649741.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/36532270205.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/pibalezogir.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/netumufaka.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_off0000b127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB127 11340 bytes
SHA-256: db81dba129c8ff04fc5d58712868bc5b1ded2ca9e2a20ee9d60a12507ae6ad2f
font_01_sfnt_off0000cb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 14064 bytes
SHA-256: cce52a64c87b7b2a76bff88c247d4377ec0441dc63d8087e8fae6f143a2c5e7e

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