Malicious PDF — malware analysis report

Static analysis result for SHA-256 737e73c2c77193c6…

MALICIOUS

PDF

86.5 KB Created: 2021-07-09 02:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ba728c29255cdce79a088736ce6df771 SHA-1: 449dacbc185f8207872001c941dd9015e4f89ecc SHA-256: 737e73c2c77193c664d3e34588a11721ff69f9c3ce6624ba13617966493a0966
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=for+the+romantic+artist PDF link annotation
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3498cd1925---84904337216.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/xojizexudiburejinodupije.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eabda63b01---bawodaxiropisadirizo.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0ddf4724cc6c8b0bda55cbcea73bd71b/vixatijapogufafu.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a8b7c0f12fda73b3e06445ca57a1df2c/33861402068.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ba46d4473e784fc38bf4dbdf2fb6ee99/95503267966.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/dumuzarewirulodog.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/76760766940.pdfIn PDF document text
    • http://www.centralperdana.com/file/83139795141.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/43d46dfd3982e31fd9fd03a49868f82b/76652210402.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/49538876595.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/mirudobaliniweg.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/gibugevesox.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/6df03b4f42403a9ca4f13cdcfdeaf685/jafinazetut.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3j06rnkgqk5jgn36i47jgpqll3/48417505181.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e355669a26b---bewijatotude.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jelavinabibokexapomo.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/doduka.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc36df0a893---81775621603.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dfd338343---jifebibeloxagivapo.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/70238563244.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/wemiguzovufomu.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/lawanisusuwetisavik.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/tizibupapekave.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/niripewokalerudubufu.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_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 16712 bytes
SHA-256: dd17e92536fbcf7055bdcda21475cdd6ab6b6961f18779c44edc93f9d2eb4ae1
font_01_sfnt_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 10428 bytes
SHA-256: 6a3da4b3b732c8637ca51321c5031eae842807b2a83c51b92ecda3a53d20c714
font_02_sfnt_off000134c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1